diff --git a/.idea/gradle.xml b/.idea/gradle.xml
index e29fddb..5711749 100644
--- a/.idea/gradle.xml
+++ b/.idea/gradle.xml
@@ -10,6 +10,7 @@
         <option name="modules">
           <set>
             <option value="$PROJECT_DIR$" />
+            <option value="$PROJECT_DIR$/base" />
             <option value="$PROJECT_DIR$/hello" />
           </set>
         </option>
diff --git a/base/build.gradle b/base/build.gradle
new file mode 100644
index 0000000..d18c3d3
--- /dev/null
+++ b/base/build.gradle
@@ -0,0 +1,2 @@
+plugins {
+}
\ No newline at end of file
diff --git a/base/src/main/java/com/ak/base/BaseUtils.java b/base/src/main/java/com/ak/base/BaseUtils.java
new file mode 100644
index 0000000..f516d5f
--- /dev/null
+++ b/base/src/main/java/com/ak/base/BaseUtils.java
@@ -0,0 +1,13 @@
+package com.ak.base;
+
+import java.util.logging.Logger;
+
+public class BaseUtils {
+  private BaseUtils() {
+  }
+
+  public static String calc(String s) {
+    Logger.getLogger(BaseUtils.class.getName()).info(() -> s);
+    return s.toUpperCase();
+  }
+}
diff --git a/base/src/main/java/com/ak/base/package-info.java b/base/src/main/java/com/ak/base/package-info.java
new file mode 100644
index 0000000..b8a3f6c
--- /dev/null
+++ b/base/src/main/java/com/ak/base/package-info.java
@@ -0,0 +1,4 @@
+@ParametersAreNonnullByDefault
+package com.ak.base;
+
+import javax.annotation.ParametersAreNonnullByDefault;
\ No newline at end of file
diff --git a/base/src/main/java/module-info.java b/base/src/main/java/module-info.java
new file mode 100644
index 0000000..69310df
--- /dev/null
+++ b/base/src/main/java/module-info.java
@@ -0,0 +1,6 @@
+module com.ak.base {
+  requires java.logging;
+  requires jsr305;
+
+  exports com.ak.base;
+}
\ No newline at end of file
diff --git a/base/src/test/java/com/ak/base/BaseUtilsTest.java b/base/src/test/java/com/ak/base/BaseUtilsTest.java
new file mode 100644
index 0000000..3ac678c
--- /dev/null
+++ b/base/src/test/java/com/ak/base/BaseUtilsTest.java
@@ -0,0 +1,11 @@
+package com.ak.base;
+
+import org.assertj.core.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+class BaseUtilsTest {
+  @Test
+  void testCalc() {
+    Assertions.assertThat(BaseUtils.calc("aBc")).isEqualTo("ABC");
+  }
+}
\ No newline at end of file
diff --git a/base/src/test/java/com/ak/base/package-info.java b/base/src/test/java/com/ak/base/package-info.java
new file mode 100644
index 0000000..b8a3f6c
--- /dev/null
+++ b/base/src/test/java/com/ak/base/package-info.java
@@ -0,0 +1,4 @@
+@ParametersAreNonnullByDefault
+package com.ak.base;
+
+import javax.annotation.ParametersAreNonnullByDefault;
\ No newline at end of file
diff --git a/hello/build.gradle b/hello/build.gradle
index 4d1cc33..19903c5 100644
--- a/hello/build.gradle
+++ b/hello/build.gradle
@@ -13,6 +13,10 @@ sonar {
     }
 }
 
+dependencies {
+    implementation project(":base")
+}
+
 application {
     mainModule = 'com.ak.app'
     mainClass = 'com.ak.app.MainApp'
diff --git a/hello/src/main/java/com/ak/app/MainApp.java b/hello/src/main/java/com/ak/app/MainApp.java
index 777d6ac..802901d 100644
--- a/hello/src/main/java/com/ak/app/MainApp.java
+++ b/hello/src/main/java/com/ak/app/MainApp.java
@@ -1,5 +1,7 @@
 package com.ak.app;
 
+import com.ak.base.BaseUtils;
+
 import java.util.logging.Logger;
 
 public class MainApp {
@@ -7,6 +9,6 @@ private MainApp() {
   }
 
   public static void main(String[] args) {
-    Logger.getLogger(MainApp.class.getName()).info(() -> "Hello word 2024.06.12!");
+    Logger.getLogger(MainApp.class.getName()).info(() -> BaseUtils.calc("Hello word 2024.06.12!"));
   }
 }
diff --git a/hello/src/main/java/module-info.java b/hello/src/main/java/module-info.java
index 653f402..008c3ac 100644
--- a/hello/src/main/java/module-info.java
+++ b/hello/src/main/java/module-info.java
@@ -2,5 +2,7 @@
   requires java.logging;
   requires jsr305;
 
+  requires com.ak.base;
+
   exports com.ak.app;
 }
\ No newline at end of file
diff --git a/settings.gradle b/settings.gradle
index e194d25..cf6fa85 100644
--- a/settings.gradle
+++ b/settings.gradle
@@ -22,4 +22,5 @@ dependencyResolutionManagement {
 }
 
 rootProject.name = 'SimpleApp'
-include 'hello'
\ No newline at end of file
+include 'hello'
+include 'base'