Try to change project structure

.github/workflows/template-cleanup.yml

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+# GitHub Actions Workflow responsible for cleaning up the JetBrains Academy Kotlin Course Template repository from the template-specific files and configurations.
+# This workflow is supposed to be triggered automatically when a new template-based repository has been created.
+
+name: Template Cleanup
+on:
+  push:
+    branches: [main, test]
+
+jobs:
+
+  # Run a cleaning process only if the workflow is triggered by the non-"kotlin-course-template" repository.
+  template-cleanup:
+    name: Template Cleanup
+    runs-on: ubuntu-latest
+    if: github.event.repository.name != 'kotlin-course-template'
+    permissions:
+      contents: write
+    steps:
+
+      # Check out current repository
+      - name: Fetch Sources
+        uses: actions/checkout@v4
+
+      # Cleanup project
+      - name: Cleanup
+        run: |
+          export LC_CTYPE=C
+          export LANG=C
+
+          # Prepare variables
+          NAME="${GITHUB_REPOSITORY##*/}"
+          ACTOR=$(echo $GITHUB_ACTOR | tr '[:upper:]' '[:lower:]')
+          SAFE_NAME=$(echo $NAME | sed 's/[^a-zA-Z0-9]//g' | tr '[:upper:]' '[:lower:]')
+          SAFE_ACTOR=$(echo $ACTOR | sed 's/[^a-zA-Z0-9]//g' | tr '[:upper:]' '[:lower:]')
+          GROUP="com.github.$SAFE_ACTOR.$SAFE_NAME"
+
+          # Replace template package name in project files with $GROUP
+          find src -type f -exec sed -i "s/org.jetbrains.academy.kotlin.template/$GROUP/g" {} +
+          find src -type f -exec sed -i "s/JetBrains Academy Kotlin Course/$NAME/g" {} +
+          find src -type f -exec sed -i "s/jetBrains-academy/$ACTOR/g" {} +
+
+          # Move content
+          mkdir -p common/src/main/kotlin/${GROUP//.//}
+          cp -R common/src/main/kotlin/org/jetbrains/academy/kotlin/template/* common/src/main/kotlin/${GROUP//.//}/
+
+          # Cleanup
+          rm -rf \
+            .github/workflows/template-cleanup.yml \
+            common/src/main/kotlin/org \
+            LICENSE
+
+      # Commit modified files
+      - name: Commit files
+        run: |
+          git config --local user.email "[email protected]"
+          git config --local user.name "GitHub Action"
+          git add .
+          git commit -m "Template cleanup"
+
+      # Push changes
+      - name: Push changes
+        uses: ad-m/github-push-action@master
+        with:
+          branch: main
+          github_token: ${{ secrets.GITHUB_TOKEN }}