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.github/workflows/template-cleanup.yml

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+# GitHub Actions Workflow responsible for cleaning up the Advent of Code Kotlin 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]
+
+jobs:
+
+  # Run cleaning process only if workflow is triggered by the non-"advent-of-code-kotlin-template" repository.
+  template-cleanup:
+    name: Template Cleanup
+    runs-on: ubuntu-latest
+    if: github.event.repository.name != 'advent-of-code-kotlin-template'
+    permissions:
+      contents: write
+    steps:
+
+      # Check out current repository
+      - name: Fetch Sources
+        uses: actions/checkout@v3
+
+      # 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.$SAFE_NAME"
+
+          # Replace placeholders in the template-cleanup files
+          sed -i "s/%ACTOR%/$ACTOR/g" .github/template-cleanup/*
+          sed -i "s/%NAME%/$NAME/g" .github/template-cleanup/*
+          sed -i "s/%REPOSITORY%/${GITHUB_REPOSITORY/\//\\/}/g" .github/template-cleanup/*
+          sed -i "s/%GROUP%/$GROUP/g" .github/template-cleanup/*
+
+          # Move content
+          cp -R .github/template-cleanup/* .
+
+          # Cleanup
+          rm -rf \
+            .github/readme \
+            .github/template-cleanup \
+            .github/workflows/template-cleanup.yml \
+            LICENSE
+          
+          # Remove leftover empty directories
+          find . -type d -empty -delete
+
+      # Commit modified files
+      - name: Commit files
+        run: |
+          git config --local user.email "action@github.com"
+          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 }}