diff --git a/build/.keep b/build/.keep
new file mode 100644
index 0000000..e69de29
diff --git a/cmd/thunderlight/thunderlight.go b/cmd/thunderlight/thunderlight.go
new file mode 100644
index 0000000..da29a2c
--- /dev/null
+++ b/cmd/thunderlight/thunderlight.go
@@ -0,0 +1,4 @@
+package main
+
+func main() {
+}
diff --git a/deployment/.keep b/deployment/.keep
new file mode 100644
index 0000000..e69de29
diff --git a/go.mod b/go.mod
index e369f7e..41d3617 100644
--- a/go.mod
+++ b/go.mod
@@ -1,5 +1,3 @@
 module github.com/thunderlight-shogi/engine
 
 go 1.22.0
-
-require github.com/gorilla/mux v1.8.1
diff --git a/go.sum b/go.sum
index 7128337..e69de29 100644
--- a/go.sum
+++ b/go.sum
@@ -1,2 +0,0 @@
-github.com/gorilla/mux v1.8.1 h1:TuBL49tXwgrFYWhqrNgrUNEY92u81SPhu7sTdzQEiWY=
-github.com/gorilla/mux v1.8.1/go.mod h1:AKf9I4AEqPTmMytcMc0KkNouC66V3BtZ4qD5fmWSiMQ=
diff --git a/internal/database/.keep b/internal/database/.keep
new file mode 100644
index 0000000..e69de29
diff --git a/engine/engine.go b/internal/engine/engine.go
similarity index 100%
rename from engine/engine.go
rename to internal/engine/engine.go
diff --git a/main.go b/main.go
deleted file mode 100644
index 46a128e..0000000
--- a/main.go
+++ /dev/null
@@ -1,7 +0,0 @@
-package main
-
-import "github.com/thunderlight-shogi/engine/website"
-
-func main() {
-	website.RunServer()
-}
diff --git a/website/.keep b/website/.keep
new file mode 100644
index 0000000..e69de29
diff --git a/website/controllers/editor.go b/website/controllers/editor.go
deleted file mode 100644
index 070e03e..0000000
--- a/website/controllers/editor.go
+++ /dev/null
@@ -1,17 +0,0 @@
-package website
-
-import (
-	"fmt"
-	"io"
-	"net/http"
-)
-
-func Editor(response http.ResponseWriter, request *http.Request, parameters map[string]string) {
-	id, ok := parameters["id"]
-
-	if !ok {
-		io.WriteString(response, "ID should be set.")
-	}
-
-	io.WriteString(response, fmt.Sprintf("ID is %s", id))
-}
diff --git a/website/controllers/home.go b/website/controllers/home.go
deleted file mode 100644
index be700b5..0000000
--- a/website/controllers/home.go
+++ /dev/null
@@ -1,10 +0,0 @@
-package website
-
-import (
-	"io"
-	"net/http"
-)
-
-func Home(response http.ResponseWriter, request *http.Request, parameters map[string]string) {
-	io.WriteString(response, "<h1>It works!</h1>")
-}
diff --git a/website/route.go b/website/route.go
deleted file mode 100644
index 8b7c37c..0000000
--- a/website/route.go
+++ /dev/null
@@ -1,31 +0,0 @@
-package website
-
-import (
-	"net/http"
-
-	"github.com/gorilla/mux"
-)
-
-type route struct {
-	method  string
-	pattern string
-	handler ParametrizedHttpHandlerFunc
-}
-
-type HttpParameters = map[string]string
-type ParametrizedHttpHandlerFunc = func(response http.ResponseWriter, request *http.Request, parameters HttpParameters)
-
-func createRoute(method string, pattern string, handler ParametrizedHttpHandlerFunc) route {
-	return route{method, pattern, handler}
-}
-
-func Get(pattern string, handler ParametrizedHttpHandlerFunc) route {
-	return createRoute("GET", pattern, handler)
-}
-
-func WrapHandler(handler ParametrizedHttpHandlerFunc) http.HandlerFunc {
-	return func(response http.ResponseWriter, request *http.Request) {
-		var parameters HttpParameters = mux.Vars(request)
-		handler(response, request, parameters)
-	}
-}
diff --git a/website/routes.go b/website/routes.go
deleted file mode 100644
index 9edb5c1..0000000
--- a/website/routes.go
+++ /dev/null
@@ -1,8 +0,0 @@
-package website
-
-import website "github.com/thunderlight-shogi/engine/website/controllers"
-
-var Routes = []route{
-	Get("/", website.Home),
-	Get("/editor/{id}", website.Editor),
-}
diff --git a/website/server.go b/website/server.go
deleted file mode 100644
index 5658ea0..0000000
--- a/website/server.go
+++ /dev/null
@@ -1,22 +0,0 @@
-package website
-
-import (
-	"fmt"
-	"net/http"
-
-	"github.com/gorilla/mux"
-)
-
-const port int = 9999
-
-func RunServer() {
-	router := mux.NewRouter()
-
-	for _, route := range Routes {
-		fmt.Printf("⚙️   The %s %s route is added.\n", route.method, route.pattern)
-		router.HandleFunc(route.pattern, WrapHandler(route.handler))
-	}
-
-	fmt.Printf("✅  The server is running at http://localhost:%d.\n", port)
-	http.ListenAndServe(fmt.Sprintf(":%d", port), router)
-}