diff --git a/.devcontainer/Dockerfile b/.devcontainer/Dockerfile
new file mode 100644
index 0000000..086c049
--- /dev/null
+++ b/.devcontainer/Dockerfile
@@ -0,0 +1,15 @@
+# [Choice] https://github.com/KEINOS/VSCode-Dev-Container-Go/pkgs/container/vscode-dev-container-go
+ARG VARIANT="latest"
+
+# -----------------------------------------------------------------------------
+#  Main Stage
+# -----------------------------------------------------------------------------
+FROM ghcr.io/keinos/vscode-dev-container-go:${VARIANT}
+
+# [Optional] Uncomment this section to install additional OS packages.
+# USER root
+# RUN apk add --no-cache <your-package-list-here>
+
+# [Optional] Uncomment this section to go install anything else you need.
+# USER vscode
+# RUN cd /tmp && go install "<your-package-here>@<version>"
diff --git a/.devcontainer/devcontainer.json b/.devcontainer/devcontainer.json
new file mode 100644
index 0000000..8965666
--- /dev/null
+++ b/.devcontainer/devcontainer.json
@@ -0,0 +1,46 @@
+// For format details, see https://aka.ms/devcontainer.json. For config options, see the README at:
+// https://github.com/microsoft/vscode-dev-containers/tree/v0.191.1/containers/go
+{
+	"name": "Go Dev",
+	"build": {
+		"dockerfile": "Dockerfile",
+		"args": {
+			// Choices: https://github.com/KEINOS/VSCode-Dev-Container-Go/pkgs/container/vscode-dev-container-go
+			"VARIANT": "latest"
+		}
+	},
+	"runArgs": [
+		"--rm",
+		"--cap-add=SYS_PTRACE",
+		"--security-opt",
+		"seccomp=unconfined"
+	],
+
+	// Set *default* container specific settings.json values on container create.
+	"settings": {
+		"go.toolsManagement.checkForUpdates": "local",
+		"go.useLanguageServer": true,
+		"go.gopath": "/go",
+		"go.goroot": "/usr/local/go",
+		"terminal.integrated.profiles.linux": {
+			"bash (login)": {
+				"path": "/bin/bash",
+				"args": []
+			}
+		}
+	},
+
+	// Add the IDs of extensions you want installed when the container is created.
+	"extensions": [
+		"golang.Go"
+	],
+
+	// Use 'forwardPorts' to make a list of ports inside the container available locally.
+	// "forwardPorts": [],
+
+	// Use 'postCreateCommand' to run commands after the container is created.
+	"postCreateCommand": "go mod download",
+
+	// Comment out to connect as root to debug container.
+	// "remoteUser": "root"
+}
\ No newline at end of file
diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 0000000..40ac025
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,33 @@
+# -----------------------------------------------------------------------------
+#  Editor settings
+# -----------------------------------------------------------------------------
+
+root = true
+
+[*]
+indent_style = space
+indent_size = 4
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[*.go]
+indent_style = tab
+
+# Shell-format
+[*.sh]
+indent_style       = space  # shfmt -i=4
+indent_size        = 4      # shfmt -i=4
+shell_variant      = posix  # shfmt -ln=posix
+binary_next_line   = false  # disable shfmt -bn
+switch_case_indent = true   # shfmt -ci
+space_redirects    = false  # disable shfmt -sr
+keep_padding       = true   # shfmt -kp
+function_next_line = false  # disable shfmt -fn
+
+[*.{yml,yaml,json}]
+indent_style = space
+indent_size = 4
+insert_final_newline = false
+quote_type = single
\ No newline at end of file
diff --git a/.github/Dockerfile b/.github/Dockerfile
new file mode 100644
index 0000000..1443b9a
--- /dev/null
+++ b/.github/Dockerfile
@@ -0,0 +1,19 @@
+# =============================================================================
+#  Test Container for Vaious Go Versions
+# =============================================================================
+# Default version
+ARG VARIANT="1.14-alpine"
+
+# -----------------------------------------------------------------------------
+#  Main Stage
+# -----------------------------------------------------------------------------
+FROM golang:${VARIANT}
+
+RUN apk add --no-cache \
+    git \
+    alpine-sdk \
+    build-base
+
+WORKDIR /workspaces
+
+ENTRYPOINT go mod download && go test -race ./...
diff --git a/.github/SECURITY.md b/.github/SECURITY.md
new file mode 100644
index 0000000..a0e4da9
--- /dev/null
+++ b/.github/SECURITY.md
@@ -0,0 +1,24 @@
+# Security Policy
+
+## Supported Go Versions
+
+We run the tests every week scheduled with the below Go versions.
+
+| Version  | Supported          |
+| :------  | :----------------: |
+| 1.14.15+ | :white_check_mark: |
+| 1.15.15+ | :white_check_mark: |
+| 1.16.8+  | :white_check_mark: |
+| 1.17.1+  | :white_check_mark: |
+
+## Code Scaning
+
+[![CodeQL](https://github.com/KEINOS/dev-go/actions/workflows/codeQL-analysis.yml/badge.svg)](https://github.com/KEINOS/dev-go/actions/workflows/codeQL-analysis.yml)
+
+## Security Status
+
+- Check the current "[Security overview](https://github.com/KEINOS/dev-go/security)" status.
+
+## Reporting a Vulnerability
+
+- Please [issue](https://github.com/KEINOS/dev-go/issues) them.
\ No newline at end of file
diff --git a/.github/docker-compose.yml b/.github/docker-compose.yml
new file mode 100644
index 0000000..7d8faec
--- /dev/null
+++ b/.github/docker-compose.yml
@@ -0,0 +1,72 @@
+# =============================================================================
+# Docker Compose file for testing on Go versions 1.14~1.17 and latest.
+# =============================================================================
+# It is recommended to run specifying a specific Go version and not at once.
+#
+# Since the service `tidy` will update/re-write the "go.mod" file to the latest
+# version, during it's process the "go.mod" file will be gone temporarily. Thus,
+# it will cause failure in the other container becaue of missing "go.mod" file.
+#
+# Recommended usage:
+#   docker-compose --file ./.github/docker-compose.yml run tidy && \
+#   docker-compose --file ./.github/docker-compose.yml run 1.14
+#
+# NOT recommended to run all tests at once whith "up":
+#   docker-compose --file ./.github/docker-compose.yml up
+version: "3.9"
+services:
+  # Service tidy updates the go.mod to the latest
+  tidy:
+    build:
+      context: ..
+      dockerfile: ./.github/Dockerfile
+      args:
+        VARIANT: 1.14-alpine
+    volumes:
+      - ..:/workspaces
+    entrypoint: [ "./.github/go-mod-tidy.sh" ]
+  # Service v1_14 runs the tests on Go v1.14
+  v1_14:
+    build:
+      context: ..
+      dockerfile: ./.github/Dockerfile
+      args:
+        VARIANT: 1.14-alpine
+    volumes:
+      - ..:/workspaces
+  # Service v1_14 runs the tests on Go v1.15
+  v1_15:
+    build:
+      context: ..
+      dockerfile: ./.github/Dockerfile
+      args:
+        VARIANT: 1.15-alpine
+    volumes:
+      - ..:/workspaces
+  # Service v1_14 runs the tests on Go v1.15
+  v1_16:
+    build:
+      context: ..
+      dockerfile: ./.github/Dockerfile
+      args:
+        VARIANT: 1.16-alpine
+    volumes:
+      - ..:/workspaces
+  # Service v1_14 runs the tests on Go v1.16
+  v1_17:
+    build:
+      context: ..
+      dockerfile: ./.github/Dockerfile
+      args:
+        VARIANT: 1.17-alpine
+    volumes:
+      - ..:/workspaces
+  # Service v1_14 runs the tests on latest Go docker image
+  latest:
+    build:
+      context: ..
+      dockerfile: ./.github/Dockerfile
+      args:
+        VARIANT: alpine
+    volumes:
+      - ..:/workspaces
diff --git a/.github/go-mod-tidy.sh b/.github/go-mod-tidy.sh
new file mode 100755
index 0000000..a1da480
--- /dev/null
+++ b/.github/go-mod-tidy.sh
@@ -0,0 +1,32 @@
+#!/bin/sh
+# =============================================================================
+#  This script updates Go modules to the latest version.
+# =============================================================================
+#  It will remove the go.mod file and run `go mod tidy` to get the latest moule
+#  versions.
+#  Then it will run the tests to make sure the code is still working, and fails
+#  if any errors are found during the process.
+#
+#  NOTE: This script is aimed to run in the container via docker-compose.
+#    See "tidy" service: ./docker-compose.yml
+# =============================================================================
+
+set -eu
+
+echo '* Backup modules ...'
+mv go.mod go.mod.bak
+mv go.sum go.sum.bak
+
+echo '* Create new blank go.mod ...'
+< go.mod.bak head -n 4 > go.mod
+
+echo '* Run go tidy ...'
+go mod tidy
+
+echo '* Run tests ...'
+go test ./... && {
+    echo '* Testing passed. Removing old go.mod file ...'
+    rm -f go.mod.bak
+    rm -f go.sum.bak
+    echo 'Successfully updated modules!'
+}
diff --git a/.github/mergify.yml b/.github/mergify.yml
new file mode 100644
index 0000000..67e00c9
--- /dev/null
+++ b/.github/mergify.yml
@@ -0,0 +1,20 @@
+pull_request_rules:
+  - name: Automatic merge on approval
+    conditions:
+      - author=KEINOS
+      - base=main
+      - title~=^Changes
+      - files=go.mod
+      - files=go.sum
+      - "#files=2"
+      - check-success=Analyze (go)
+      - check-success=build
+      - check-success=Unit test (ubuntu-latest)
+      - check-success=Unit test (macos-latest)
+      - check-success=Unit test (windows-latest)
+      - check-success=CodeQL
+      - check-success=codecov/patch
+      - check-success=codecov/project
+    actions:
+      merge:
+        method: merge
\ No newline at end of file
diff --git a/.github/workflows/code-coverage.yml b/.github/workflows/code-coverage.yml
new file mode 100644
index 0000000..b3d3e60
--- /dev/null
+++ b/.github/workflows/code-coverage.yml
@@ -0,0 +1,29 @@
+# This workflow updates the code coverage of Codecov.
+# It runs the unit test and pushes the measured code coverage analysis.
+name: "Codecov"
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    # The branches below must be a subset of the branches above
+    branches: [ main ]
+  schedule:
+    # Runs at 16:40 UTC on day-of-month 1 (Every day-of-month 1 at AM 01:40 JST, my time)
+    # See: https://crontab.guru/
+    - cron: '40 16 1 * *'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 2
+      - uses: actions/setup-go@v2
+        with:
+          go-version: '1.14'
+      - name: Run coverage
+        run: go test -coverprofile=coverage.out -covermode=atomic ./...
+      - name: Upload coverage to Codecov
+        run: bash <(curl -s https://codecov.io/bash)
diff --git a/.github/workflows/codeQL-analysis.yml b/.github/workflows/codeQL-analysis.yml
new file mode 100644
index 0000000..0d709a3
--- /dev/null
+++ b/.github/workflows/codeQL-analysis.yml
@@ -0,0 +1,68 @@
+# For most projects, this workflow file will not need changing; you simply need
+# to commit it to your repository.
+#
+# You may wish to alter this file to override the set of languages analyzed,
+# or to provide custom queries or build logic.
+#
+name: "CodeQL"
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    # The branches below must be a subset of the branches above
+    branches: [ main ]
+  schedule:
+    # Runs at 16:30 UTC on day-of-month 1 (Every day-of-month 1 at AM 01:30 JST, my time)
+    # See: https://crontab.guru/
+    - cron: '30 16 1 * *'
+
+jobs:
+  analyze:
+    name: Analyze
+    runs-on: ubuntu-latest
+    permissions:
+      actions: read
+      contents: read
+      security-events: write
+
+    strategy:
+      fail-fast: false
+      matrix:
+        language: [ 'go' ]
+        # CodeQL supports [ 'cpp', 'csharp', 'go', 'java', 'javascript', 'python' ]
+        # Learn more:
+        # https://docs.github.com/en/free-pro-team@latest/github/finding-security-vulnerabilities-and-errors-in-your-code/configuring-code-scanning#changing-the-languages-that-are-analyzed
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v2
+
+    # Initializes the CodeQL tools for scanning.
+    - name: Initialize CodeQL
+      uses: github/codeql-action/init@v1
+      with:
+        languages: ${{ matrix.language }}
+        # If you wish to specify custom queries, you can do so here or in a config file.
+        # By default, queries listed here will override any specified in a config file.
+        # Prefix the list here with "+" to use these queries and those in the config file.
+        # queries: ./path/to/local/query, your-org/your-repo/queries@main
+
+    # Autobuild attempts to build any compiled languages  (C/C++, C#, or Java).
+    # If this step fails, then you should remove it and run the build manually (see below)
+    - name: Autobuild
+      uses: github/codeql-action/autobuild@v1
+
+    # ℹ️ Command-line programs to run using the OS shell.
+    # 📚 https://git.io/JvXDl
+
+    # ✏️ If the Autobuild fails above, remove it and uncomment the following three lines
+    #    and modify them (or add more) to build your code if your project
+    #    uses a compiled language
+
+    #- run: |
+    #   make bootstrap
+    #   make release
+
+    - name: Perform CodeQL Analysis
+      uses: github/codeql-action/analyze@v1
diff --git a/.github/workflows/go-test.yml b/.github/workflows/go-test.yml
new file mode 100644
index 0000000..04ecc3c
--- /dev/null
+++ b/.github/workflows/go-test.yml
@@ -0,0 +1,41 @@
+# This workflow runs the unit test (`go test ./...`) on vaious platforms,
+# such as: Linux, macOS and Windows.
+name: UnitTests
+
+on:
+  workflow_dispatch:
+  pull_request:
+
+jobs:
+  coverage:
+    name: Unit test
+
+    strategy:
+      matrix:
+        platform: [ubuntu-latest, macos-latest, windows-latest]
+
+    runs-on: ${{ matrix.platform }}
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - uses: actions/setup-go@v2
+        with:
+          go-version: '^1.17'
+
+      - name: Use Cache
+        uses: actions/cache@v2
+        with:
+          path: ~/go/pkg/mod
+          key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
+          restore-keys: |
+            ${{ runner.os }}-go-
+
+      - name: Download Modules
+        if: steps.cache.outputs.cache-hit != 'true'
+        run: go mod download
+
+      - name: Run unit test
+        run: |
+          go mod download
+          go test -race -v ./...
diff --git a/.github/workflows/go-versions.yml b/.github/workflows/go-versions.yml
new file mode 100644
index 0000000..6ac69fa
--- /dev/null
+++ b/.github/workflows/go-versions.yml
@@ -0,0 +1,84 @@
+name: go1.14+
+
+on:
+  workflow_dispatch:
+  push:
+    branches: [ main ]
+  schedule:
+    # Runs at 16:05 UTC on day-of-month 1 (Every day-of-month 1 at AM 01:05 JST, my time)
+    # See: https://crontab.guru/
+    - cron: '5 16 1 * *'
+
+env:
+  PATH_CACHE: /tmp/docker-img-arch
+
+jobs:
+  go:
+    name: Run tests on Go via container
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v2
+
+      - name: Create image tag
+        id: imagetag
+        run: |
+          HASH_IMAGE=${{ hashFiles('./.github/Dockerfile') }}
+          VARIANT=$(TZ=UTC-9 date '+%Y%m')
+          TAG="${HASH_IMAGE:0:7}:${VARIANT}"
+          PATH_TAR=${{ env.PATH_CACHE }}"/tar"
+          echo "::set-output name=TAG::${TAG}"
+          echo "::set-output name=PATH_TAR::${PATH_TAR}"
+
+      - name: Cache or restore image archive
+        id: cache
+        uses: actions/cache@v2
+        with:
+          path: ${{ env.PATH_CACHE }}
+          key: ${{ steps.imagetag.outputs.TAG }}
+
+      - name: Load Docker images if exist
+        if: steps.cache.outputs.cache-hit == 'true'
+        run: |
+          docker load --input ${{ steps.imagetag.outputs.PATH_TAR }}/github_v1_14_1.tar
+          docker load --input ${{ steps.imagetag.outputs.PATH_TAR }}/github_v1_15_1.tar
+          docker load --input ${{ steps.imagetag.outputs.PATH_TAR }}/github_v1_16_1.tar
+          docker load --input ${{ steps.imagetag.outputs.PATH_TAR }}/github_v1_17_1.tar
+          docker load --input ${{ steps.imagetag.outputs.PATH_TAR }}/github_latest_1.tar
+
+      - name: Pull base images if no-exist
+        if: steps.cache.outputs.cache-hit != 'true'
+        run: |
+          : # Pull images one-by-one for stability
+          docker pull golang:1.14-alpine
+          docker pull golang:1.15-alpine
+          docker pull golang:1.16-alpine
+          docker pull golang:1.17-alpine
+          docker pull golang:alpine
+
+      - name: Build Docker images if no-exists
+        if: steps.cache.outputs.cache-hit != 'true'
+        run: |
+          mkdir -p ${{ steps.imagetag.outputs.PATH_TAR }}
+          : # Build container images
+          docker-compose --file ./.github/docker-compose.yml build
+
+      - name: Save built images if no-exists
+        if: steps.cache.outputs.cache-hit != 'true'
+        run: |
+          docker save --output ${{ steps.imagetag.outputs.PATH_TAR }}/github_v1_14_1.tar github_v1_14:latest
+          docker save --output ${{ steps.imagetag.outputs.PATH_TAR }}/github_v1_15_1.tar github_v1_15:latest
+          docker save --output ${{ steps.imagetag.outputs.PATH_TAR }}/github_v1_16_1.tar github_v1_16:latest
+          docker save --output ${{ steps.imagetag.outputs.PATH_TAR }}/github_v1_17_1.tar github_v1_17:latest
+          docker save --output ${{ steps.imagetag.outputs.PATH_TAR }}/github_latest_1.tar github_latest:latest
+
+      - name: Run tests on Go 1.14
+        run: docker-compose --file ./.github/docker-compose.yml run v1_14
+      - name: Run tests on Go 1.15
+        run: docker-compose --file ./.github/docker-compose.yml run v1_15
+      - name: Run tests on Go 1.16
+        run: docker-compose --file ./.github/docker-compose.yml run v1_16
+      - name: Run tests on Go 1.17
+        run: docker-compose --file ./.github/docker-compose.yml run v1_17
+      - name: Run tests on latest Go
+        run: docker-compose --file ./.github/docker-compose.yml run latest
diff --git a/.github/workflows/golangci-lint.yml b/.github/workflows/golangci-lint.yml
new file mode 100644
index 0000000..6f0b56e
--- /dev/null
+++ b/.github/workflows/golangci-lint.yml
@@ -0,0 +1,30 @@
+# Details of this action see: https://github.com/golangci/golangci-lint-action
+name: golangci-lint
+
+on:
+  workflow_dispatch:
+  push:
+    branches: [ main ]
+
+jobs:
+  golangci:
+    name: lint
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: golangci-lint
+        uses: golangci/golangci-lint-action@v2
+        with:
+          version: latest
+
+          # Optional: working directory, useful for monorepos
+          # working-directory: somedir
+
+          # Optional: golangci-lint command line arguments.
+          args: --config ./.golangci.yml
+
+          # Optional: show only new issues if it's a pull request. The default value is `false`.
+          # only-new-issues: true
+
+          # Optional: if set to true then the action will use pre-installed Go
+          # skip-go-installation: true
diff --git a/.github/workflows/release_bin.yml b/.github/workflows/release_bin.yml
new file mode 100644
index 0000000..41abb88
--- /dev/null
+++ b/.github/workflows/release_bin.yml
@@ -0,0 +1,34 @@
+# =============================================================================
+#  Release Assets and Homebrew's Tap
+# =============================================================================
+# This workflow will build the binaries and push the archives to the assets in
+# the releases page if a release was created. Then pushes the tap config file
+# for Homebrew tap. See: ../../.goreleaser.yml
+name: Release
+
+on:
+  workflow_dispatch:
+  release:
+    types:
+      - created
+    tags:
+      - 'v*'
+jobs:
+  goreleaser:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      - name: Set up Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: '1.17.x'
+      - name: Run GoReleaser
+        uses: goreleaser/goreleaser-action@v2
+        with:
+          version: latest
+          args: release --config .goreleaser.yml
+        env:
+          GITHUB_TOKEN: ${{ secrets.PERSONAL_ACCESS_TOKEN }}
diff --git a/.github/workflows/weekly-update.yml b/.github/workflows/weekly-update.yml
new file mode 100644
index 0000000..d185569
--- /dev/null
+++ b/.github/workflows/weekly-update.yml
@@ -0,0 +1,49 @@
+# =============================================================================
+#  Weekly Module Update
+# =============================================================================
+# This workflow runs weekly to update and test the latest `go.mod` version.
+#
+# If all the tests succeeds to run in all Go versions, it will create a new PR
+# of the `go.mod` and `go.sum`.
+#
+# NOTE:
+# You need to set the `PERSONAL_ACCESS_TOKEN` environment variable in the repo's
+#     [Settings]-[Secrets]-[Actions secrets]
+# To generate a new token go to:
+#     https://github.com/settings/tokens
+#     * You need add the "repo" scope to the token but no more.
+# =============================================================================
+name: Weekly Update
+
+on:
+  workflow_dispatch:
+  schedule:
+    # Runs at 18:00 UTC on Sun (JST: AM 03:00 on every Monday)
+    - cron: '0 18 * * SUN'
+
+jobs:
+  automated_build:
+    runs-on: ubuntu-latest
+
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Update go.mod and run tests
+        run: |
+          set -eu
+          docker-compose --file ./.github/docker-compose.yml run tidy && \
+          docker-compose --file ./.github/docker-compose.yml run v1_14 && \
+          docker-compose --file ./.github/docker-compose.yml run v1_15 && \
+          docker-compose --file ./.github/docker-compose.yml run v1_16 && \
+          docker-compose --file ./.github/docker-compose.yml run v1_17 && \
+          docker-compose --file ./.github/docker-compose.yml run latest
+
+      - name: Create Pull Request on Change
+        uses: peter-evans/create-pull-request@v3
+        with:
+            token: ${{ secrets.PERSONAL_ACCESS_TOKEN }}
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..22fdbf0
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+# Ignore distribution/binary release directory
+dist/
+bin/
diff --git a/.golangci.yml b/.golangci.yml
new file mode 100644
index 0000000..6a68e4e
--- /dev/null
+++ b/.golangci.yml
@@ -0,0 +1,237 @@
+# This file contains configuration options for GolangCI-Lint.
+# - Available linters see: https://golangci-lint.run/usage/linters/
+# - Sample of config see: https://golangci-lint.run/usage/configuration/#config-file
+
+# options for analysis running
+run:
+  # include test files or not, default is true
+  tests: true
+
+  fast: true
+
+  # list of build tags, all linters use it. Default is empty list.
+  build-tags:
+    - golangci
+
+  # which dirs to skip: issues from them won't be reported;
+  # can use regexp here: generated.*, regexp is applied on full path;
+  # default value is empty list, but default dirs are skipped independently
+  # from this option's value (see skip-dirs-use-default).
+  # "/" will be replaced by current OS file path separator to properly work
+  # on Windows.
+  skip-dirs:
+    - .devcontainer
+    - .github
+    - .vscode
+    - bin
+
+  # Allow multiple parallel golangci-lint instances running.
+  # If false (default) - golangci-lint acquires file lock on start.
+  allow-parallel-runners: true
+
+# output configuration options
+output:
+  # colored-line-number|line-number|json|tab|checkstyle|code-climate, default is "colored-line-number"
+  format: colored-line-number
+
+  # sorts results by: filepath, line and column
+  sort-results: true
+
+# enabled linters. Conf settings follows.
+linters:
+  enable:
+    - deadcode # Finds unused code
+    - dogsled
+    - dupl
+    - errcheck # Errcheck is a program for checking for unchecked errors in go programs. These unchecked errors can be critical bugs in some cases
+    - funlen
+    - gocognit
+    - gocritic
+    - gocyclo
+    - godot
+    - godox
+    - gofmt
+    - gofumpt     # Stricter gofmt
+    #- golint      # Deprecated. Use revive
+    - gosec       # Inspects source code for security problems
+    - gosimple    # Linter for Go source code that specializes in simplifying a code
+    - govet       # Vet examines Go source code and reports suspicious constructs, such as Printf calls whose arguments do not align with the format string
+    - ifshort
+    - ineffassign # Detects when assignments to existing variables are not used
+    - lll
+    - megacheck   # gosimple, staticcheck, unused
+    - misspell    # Find commonly misspelled English words in comments
+    - nakedret    # Limit naked returns in functions greater than a specified function length
+    - nestif      # Limit if statements nested deep
+    - nolintlint  # Don't allow 'nolint' annotation w/out a description
+    - nlreturn    # Requires a new line before return
+    - prealloc    # Finds slice declarations that could potentially be preallocated
+    - predeclared # Find code that shadows one of Go's predeclared identifiers
+    - revive      # Fast, configurable, extensible, flexible, and beautiful linter for Go. Drop-in replacement of golint
+    - staticcheck # Staticcheck is a go vet on steroids, applying a ton of static analysis checks
+    - structcheck # Finds unused struct fields
+    - stylecheck
+    - typecheck   # Like the front-end of a Go compiler, parses and type-checks Go code
+    - unconvert   # Detect unnecessary type conversions
+    - unused      # Checks Go code for unused constants, variables, functions and types
+    #- testpackage # Limit use unexported functions and methods from source code in tests
+    - thelper     # Enforce to call 't.Helper()' in the test helper function
+    - varcheck    # Finds unused global variables and constants
+    - whitespace  # Limit unnecessary newlines at the start and end of functions, if, for, etc
+    - wsl         # Enforce empty lines at the right places to make code more readable.
+
+# settings of linters
+linters-settings:
+  dogsled:
+    # checks assignments with too many blank identifiers; default is 2
+    max-blank-identifiers: 2
+  dupl:
+    # tokens count to trigger issue, 150 by default
+    threshold: 100
+  errcheck:
+    # report about not checking of errors in type assertions: `a := b.(MyStruct)`;
+    # default is false: such cases aren't reported by default.
+    check-type-assertions: true
+  funlen:
+    lines: 60
+    statements: 40
+  gocognit:
+    # minimal code complexity to report, 30 by default (but we recommend 10-20)
+    min-complexity: 10
+  gocritic:
+    # Which checks should be enabled; can't be combined with 'disabled-checks';
+    # See https://go-critic.github.io/overview#checks-overview
+    # To check which checks are enabled run `GL_DEBUG=gocritic golangci-lint run`
+    # By default list of stable checks is used.
+    enabled-checks:
+      - rangeValCopy
+      - hugeParam
+    # The settings key is the name of a supported gocritic checker.
+    # The list of supported checkers can be find in https://go-critic.github.io/overview.
+    settings:
+      hugeParam:
+        # size in bytes that makes the warning trigger (default 80)
+        sizeThreshold: 70
+  gocyclo:
+    # minimal code complexity to report, 30 by default (but we recommend 10-20)
+    min-complexity: 10
+  godot:
+    # check that each sentence starts with a capital letter
+    capital: true
+  godox:
+    # report any comments starting with keywords, this is useful for TODO or FIXME comments that
+    # might be left in the code accidentally and should be resolved before merging
+    keywords: # default keywords are TODO, BUG, and FIXME, these can be overwritten by this setting
+      - TODO
+      - BUG
+      - FIXME
+  gofmt:
+    # simplify code: gofmt with `-s` option, true by default
+    simplify: true
+  gofumpt:
+    # Choose whether or not to use the extra rules that are disabled
+    # by default
+    extra-rules: false
+  golint:
+    # minimal confidence for issues, default is 0.8
+    min-confidence: 0.95
+  govet:
+    enable-all: true
+  ifshort:
+    # Maximum length of variable declaration measured in number of lines, after which linter won't suggest using short syntax.
+    # Has higher priority than max-decl-chars.
+    max-decl-lines: 1
+    # Maximum length of variable declaration measured in number of characters, after which linter won't suggest using short syntax.
+    max-decl-chars: 30
+  lll:
+    # max line length, lines longer will be reported. Default is 120.
+    # '\t' is counted as 1 character by default, and can be changed with the tab-width option
+    line-length: 120
+    # tab width in spaces. Default to 1.
+    tab-width: 1
+  maligned:
+    # print struct with more effective memory layout or not, false by default
+    suggest-new: true
+  misspell:
+    # Correct spellings using locale preferences for US or UK.
+    # Default is to use a neutral variety of English.
+    # Setting locale to US will correct the British spelling of 'colour' to 'color'.
+    locale: US
+  nakedret:
+    # make an issue if func has more lines of code than this setting and it has naked returns; default is 30
+    max-func-lines: 25
+  nestif:
+    # minimal complexity of if statements to report, 5 by default
+    min-complexity: 4
+  nolintlint:
+    # Enable to ensure that nolint directives are all used. Default is true.
+    allow-unused: false
+    # Disable to ensure that nolint directives don't have a leading space. Default is true.
+    allow-leading-space: false
+    # Enable to require an explanation of nonzero length after each nolint directive. Default is false.
+    require-explanation: true
+    # Enable to require nolint directives to mention the specific linter being suppressed. Default is false.
+    require-specific: true
+  unused:
+    # treat code as a program (not a library) and report unused exported identifiers; default is false.
+    # XXX: if you enable this setting, unused will report a lot of false-positives in text editors:
+    # if it's called for subdir of a project it can't find funcs usages. All text editor integrations
+    # with golangci-lint call it on a directory with the changed file.
+    check-exported: false
+  revive:
+    # see https://github.com/mgechev/revive#available-rules for details.
+    ignore-generated-header: true
+    severity: warning
+    rules:
+      - name: indent-error-flow
+        severity: warning
+  testpackage:
+    # regexp pattern to skip files. ***_internal_test.go and ***_export_test.go are the exception.
+    skip-regexp: (export|internal)_test\.go
+  thelper:
+    # The following configurations enable all checks. It can be omitted because all checks are enabled by default.
+    # You can enable only required checks deleting unnecessary checks.
+    test:
+      first: true
+      name: true
+      begin: true
+    benchmark:
+      first: true
+      name: true
+      begin: true
+  whitespace:
+    multi-if: false   # Enforces newlines (or comments) after every multi-line if statement
+    multi-func: false # Enforces newlines (or comments) after every multi-line function signature
+  wsl:
+    # If true append is only allowed to be cuddled if appending value is
+    # matching variables, fields or types on line above. Default is true.
+    strict-append: true
+    # Allow calls and assignments to be cuddled as long as the lines have any
+    # matching variables, fields or types. Default is true.
+    allow-assign-and-call: true
+    # Allow multiline assignments to be cuddled. Default is true.
+    allow-multiline-assign: true
+    # Allow declarations (var) to be cuddled.
+    allow-cuddle-declarations: false
+    # Allow trailing comments in ending of blocks
+    allow-trailing-comment: false
+    # Force newlines in end of case at this limit (0 = never).
+    force-case-trailing-whitespace: 0
+    # Force cuddling of err checks with err var assignment
+    force-err-cuddling: false
+    # Allow leading comments to be separated with empty liens
+    allow-separated-leading-comment: false
+  errorlint:
+    # Report non-wrapping error creation using fmt.Errorf
+    errorf: true
+  makezero:
+    # Allow only slices initialized with a length of zero. Default is false.
+    always: false
+  forbidigo:
+    # Forbid the following identifiers
+    forbid:
+      - fmt.Errorf # consider errors.Errorf in github.com/pkg/errors
+      - fmt.Print.* # too much log noise
+      - ginkgo\\.F.* # these are used just for local development
+    # Exclude godoc examples from forbidigo checks.  Default is true.
+    exclude_godoc_examples: false
\ No newline at end of file
diff --git a/.goreleaser.yml b/.goreleaser.yml
new file mode 100644
index 0000000..2654fa2
--- /dev/null
+++ b/.goreleaser.yml
@@ -0,0 +1,109 @@
+# =============================================================================
+#  Configuration for `goreleaser`.
+# =============================================================================
+#  For local-test run:
+#    $ goreleaser release --snapshot --skip-publish --rm-dist
+#    $ # *Note: Check the ./bin/ dir after ran.
+#
+#  Make sure to check the documentation as well at:
+#    https://goreleaser.com/customization/
+# =============================================================================
+before:
+  hooks:
+    - go mod download
+# Name to use on test release with --snapshot option.
+snapshot:
+  name_template: '{{ .Version }}'
+
+# Directory name to distribute
+dist: bin
+
+# Settings to build the binaries.
+builds:
+  -
+    # Target directory of main.go package
+    main: ./cmd/whereami
+    # Output binary name
+    binary: whereami
+    env:
+      - CGO_ENABLED=0
+    # Target OS
+    goos:
+      - linux
+      - windows
+      - darwin
+    # Target architectures
+    goarch:
+      - amd64
+      - arm
+      - arm64
+    # Variant for ARM32
+    goarm:
+      - "5"
+      - "6"
+      - "7"
+    # Ignore ARM32/ARM64 build for both macOS and Windows
+    ignore:
+      - goos: darwin
+        goarch: arm
+      - goos: windows
+        goarch: arm
+      - goos: windows
+        goarch: arm64
+    # Build the app as static binary and embed version and commit info
+    ldflags:
+      - -s -w -extldflags '-static' -X 'main.version={{.Version}}' -X 'main.commit={{ .ShortCommit }}'
+
+# macOS universal binaries for both arm64 and amd64
+universal_binaries:
+  -
+    name_template: 'whereami'
+    # Combine arm64 and amd64 as a single binary and remove each
+    replace: true
+
+# Archiving the built binaries
+archives:
+  -
+    replacements:
+      darwin: macOS
+      linux: Linux
+      windows: Windows
+      amd64: x86_64
+    format_overrides:
+      - goos: windows
+        format: zip
+      - goos: darwin
+        format: zip
+
+# Create checksum file of archived files
+checksum:
+  name_template: 'checksums.txt'
+
+# Release/update Homebrew tap repository
+brews:
+  -
+    # Name of the Homebrew package: /<TAP REPO ROOT DIR>/Formula/<name>.rb
+    name: whereami
+    # Target repo to tap: KEINOS/homebrew-apps
+    tap:
+      owner: KEINOS
+      name: homebrew-apps
+    # Target directory: KEINOS/homebrew-apps/Formula
+    folder: Formula
+    # URL of the archive in releases page
+    url_template: "https://github.com/KEINOS/whereami/releases/download/{{ .Tag }}/{{ .ArtifactName }}"
+    # Author info to commit to the tap repo
+    commit_author:
+      name: goreleaserbot
+      email: goreleaser@carlosbecker.com
+    # Message to display on `brew search` or `brew info`
+    description: "This is a command line utility that prints the current global/public IP address."
+    homepage: "https://github.com/KEINOS/whereami/"
+    # Let brew command pull the archive via cURL
+    download_strategy: CurlDownloadStrategy
+    # Let brew command instll the binary as `whereami`
+    install: |
+      bin.install "whereami"
+    # Smoke test to run after install
+    test: |
+      system "#{bin}/whereami --version"
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..2b0e796
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2021 KEINOS and the WhoAmI contributors
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..3031bf8
--- /dev/null
+++ b/README.md
@@ -0,0 +1,18 @@
+# WhereAmI
+
+`whereami` is a command line utility that prints the current global/public IP address.
+
+```bash
+$ whereami
+123.13.14.253
+```
+
+## Install
+
+- Via [Homebrew](https://brew.sh/) for macOS, Linux and Windows WSL2. (Intel,AMD64/ARM64,M1)
+
+    ```bash
+    brew install KEINOS/apps/whereami
+    ```
+
+- For manual download or other architectures see [releases page](/).
diff --git a/cmd/whereami/main.go b/cmd/whereami/main.go
new file mode 100644
index 0000000..ceae512
--- /dev/null
+++ b/cmd/whereami/main.go
@@ -0,0 +1,18 @@
+package main
+
+import (
+	"fmt"
+
+	"github.com/KEINOS/go-utiles/util"
+)
+
+func main() {
+	util.ExitOnErr(Run())
+}
+
+// Run is the actual function of the app.
+func Run() error {
+	fmt.Println("Hello, Gopher!")
+
+	return nil
+}
diff --git a/cmd/whereami/main_test.go b/cmd/whereami/main_test.go
new file mode 100644
index 0000000..ebf76fb
--- /dev/null
+++ b/cmd/whereami/main_test.go
@@ -0,0 +1,16 @@
+package main
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/zenizh/go-capturer"
+)
+
+func Test_main(t *testing.T) {
+	out := capturer.CaptureStdout(func() {
+		main()
+	})
+
+	assert.Equal(t, out, "Hello, Gopher!\n")
+}
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..0391bd5
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,9 @@
+module github.com/KEINOS/dev-go
+
+go 1.14
+
+require (
+	github.com/KEINOS/go-utiles v1.5.3
+	github.com/stretchr/testify v1.7.0
+	github.com/zenizh/go-capturer v0.0.0-20211219060012-52ea6c8fed04
+)
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..ff3e443
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,56 @@
+github.com/KEINOS/go-utiles v1.5.3 h1:IIo5qacRuR5adSfmojPKYjZjAaxw4I4Vv4iphsueOxM=
+github.com/KEINOS/go-utiles v1.5.3/go.mod h1:kDM/EQVRa4w+JNWiBcJFqELacpHT+5uVxnx327Drh38=
+github.com/MakeNowJust/heredoc v1.0.0 h1:cXCdzVdstXyiTqTvfqk9SDHpKNjxuom+DOlyEeQ4pzQ=
+github.com/MakeNowJust/heredoc v1.0.0/go.mod h1:mG5amYoWBHf8vpLOuehzbGGw0EHxpZZ6lCpQ4fNJ8LE=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/fzipp/gocyclo v0.3.1/go.mod h1:DJHO6AUmbdqj2ET4Z9iArSuwWgYDRryYt2wASxc7x3E=
+github.com/jedib0t/go-pretty/v6 v6.2.4 h1:wdaj2KHD2W+mz8JgJ/Q6L/T5dB7kyqEFI16eLq7GEmk=
+github.com/jedib0t/go-pretty/v6 v6.2.4/go.mod h1:+nE9fyyHGil+PuISTCrp7avEdo6bqoMwqZnuiK2r2a0=
+github.com/kami-zh/go-capturer v0.0.0-20171211120116-e492ea43421d h1:cVtBfNW5XTHiKQe7jDaDBSh/EVM4XLPutLAGboIXuM0=
+github.com/kami-zh/go-capturer v0.0.0-20171211120116-e492ea43421d/go.mod h1:P2viExyCEfeWGU259JnaQ34Inuec4R38JCyBx2edgD0=
+github.com/klauspost/cpuid/v2 v2.0.9 h1:lgaqFMSdTdQYdZ04uHyN2d/eKdOMyi2YLSvlQIBFYa4=
+github.com/klauspost/cpuid/v2 v2.0.9/go.mod h1:FInQzS24/EEf25PyTYn52gqo7WaD8xa0213Md/qVLRg=
+github.com/mattn/go-runewidth v0.0.9 h1:Lm995f3rfxdpd6TSmuVCHVb/QhupuXlYr8sCI/QdE+0=
+github.com/mattn/go-runewidth v0.0.9/go.mod h1:H031xJmbD/WCDINGzjvQ9THkh0rPKHF+m2gUSrubnMI=
+github.com/mr-tron/base58 v1.1.0 h1:Y51FGVJ91WBqCEabAi5OPUz38eAx8DakuAm5svLcsfQ=
+github.com/mr-tron/base58 v1.1.0/go.mod h1:xcD2VGqlgYjBdcBLw+TuYLr8afG+Hj8g2eTVqeSzSU8=
+github.com/multiformats/go-base32 v0.0.3 h1:tw5+NhuwaOjJCC5Pp82QuXbrmLzWg7uxlMFp8Nq/kkI=
+github.com/multiformats/go-base32 v0.0.3/go.mod h1:pLiuGC8y0QR3Ue4Zug5UzK9LjgbkL8NSQj0zQ5Nz/AA=
+github.com/multiformats/go-base36 v0.1.0 h1:JR6TyF7JjGd3m6FbLU2cOxhC0Li8z8dLNGQ89tUg4F4=
+github.com/multiformats/go-base36 v0.1.0/go.mod h1:kFGE83c6s80PklsHO9sRn2NCoffoRdUUOENyW/Vv6sM=
+github.com/multiformats/go-multibase v0.0.3 h1:l/B6bJDQjvQ5G52jw4QGSYeOTZoAwIO77RblWplfIqk=
+github.com/multiformats/go-multibase v0.0.3/go.mod h1:5+1R4eQrT3PkYZ24C3W2Ue2tPwIdYQD509ZjSb5y9Oc=
+github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
+github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/pkg/profile v1.2.1/go.mod h1:hJw3o1OdXxsrSjjVksARp5W95eeEaEfptyVZyv6JUPA=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
+github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
+github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+github.com/zenizh/go-capturer v0.0.0-20211219060012-52ea6c8fed04 h1:qXafrlZL1WsJW5OokjraLLRURHiw0OzKHD/RNdspp4w=
+github.com/zenizh/go-capturer v0.0.0-20211219060012-52ea6c8fed04/go.mod h1:FiwNQxz6hGoNFBC4nIx+CxZhI3nne5RmIOlT/MXcSD4=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
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