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.github/template-cleanup/README.md

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+# %NAME%
+
+Welcome to the Advent of Code[^aoc] Kotlin project created by [%ACTOR%][github] using the [Advent of Code Kotlin Template][template] delivered by JetBrains.
+
+In this repository, %ACTOR% is about to provide solutions for the puzzles using [Kotlin][kotlin] language.
+
+If you're stuck with Kotlin-specific questions or anything related to this template, check out the following resources:
+
+- [Kotlin docs][docs]
+- [Kotlin Slack][slack]
+- Template [issue tracker][issues]
+
+
+[^aoc]:
+    [Advent of Code][aoc] – An annual event of Christmas-oriented programming challenges started December 2015.
+    Every year since then, beginning on the first day of December, a programming puzzle is published every day for twenty-five days.
+    You can solve the puzzle and provide an answer using the language of your choice.
+
+[aoc]: https://adventofcode.com
+[docs]: https://kotlinlang.org/docs/home.html
+[github]: https://github.com/%ACTOR%
+[issues]: https://github.com/kotlin-hands-on/advent-of-code-kotlin-template/issues
+[kotlin]: https://kotlinlang.org
+[slack]: https://surveys.jetbrains.com/s3/kotlin-slack-sign-up
+[template]: https://github.com/kotlin-hands-on/advent-of-code-kotlin-template

.github/template-cleanup/settings.gradle.kts

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+rootProject.name = "%NAME%"

.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 }}