Create kotlin template generator GHA

.github/workflows/kotlin-template.yaml

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+name: Kotlin template auto-generator
+
+on:
+  schedule:
+    - cron: "0 18 * * *"
+  workflow_dispatch:
+
+jobs:
+  setup-day:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      - name: Set up Git
+        run: |
+          git config user.name "GitHub Action"
+          git config user.email "[email protected]"
+
+      - name: Calculate Next Day
+        id: day
+        run: |
+          TODAY=$(date -u +"%Y-%m-%d")
+          CURRENT_DAY=$(date -u -d "$TODAY" +%-d)
+          NEXT_DAY=$((CURRENT_DAY + 1))
+          if [ "$NEXT_DAY" -gt 25 ]; then
+            echo "delete=true" >> $GITHUB_ENV
+            exit 0
+          fi
+          echo "delete=false" >> $GITHUB_ENV
+          echo "DAY=$(printf '%02d' $NEXT_DAY)" >> $GITHUB_ENV
+
+      - name: Generate folders and copy templates
+        if: env.delete == 'false'
+        run: |
+          DAY_FOLDER="2024/kotlin/src/main/kotlin/com/tymscar/day${{ env.DAY }}"
+          mkdir -p "$DAY_FOLDER/part1" "$DAY_FOLDER/part2"
+
+          cp templates/kotlin/day.kt "$DAY_FOLDER/day${{ env.DAY }}.kt"
+          cp templates/kotlin/part1/part1.kt "$DAY_FOLDER/part1/part1.kt"
+          cp templates/kotlin/part2/part2.kt "$DAY_FOLDER/part2/part2.kt"
+
+          sed -i "s/{{DAY}}/${{ env.DAY }}/g" "$DAY_FOLDER/day${{ env.DAY }}.kt"
+          sed -i "s/{{DAY}}/${{ env.DAY }}/g" "$DAY_FOLDER/part1/part1.kt"
+          sed -i "s/{{DAY}}/${{ env.DAY }}/g" "$DAY_FOLDER/part2/part2.kt"
+
+          git add .
+          git commit -m "Setup files for Day ${{ env.DAY }}"
+          git push
+
+      - name: Delete workflow if past December 25
+        if: env.delete == 'true'
+        run: |
+          rm -rf templates
+          rm -f .github/workflows/kotlin-template.yaml
+          git add templates .github/workflows/kotlin-template.yaml
+          git commit -m "Kotlin template generator removed"
+          git push

templates/kotlin/day.kt

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+package com.tymscar.day{{DAY}}
+
+import java.io.File
+import com.tymscar.day{{DAY}}.part1.solve as part1
+import com.tymscar.day{{DAY}}.part2.solve as part2
+
+fun solve() {
+    var input: String = File("src/main/kotlin/com/tymscar/day{{DAY}}/input.txt").readText()
+
+    println("Day {{DAY}}: ")
+    println("Part 1: ${part1(input)}")
+    println("Part 2: ${part2(input)}")
+}

templates/kotlin/part1/part1.kt

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+package com.tymscar.day{{DAY}}.part1
+
+fun solve(input: String): String {
+    return input
+}

templates/kotlin/part2/part2.kt

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+package com.tymscar.day{{DAY}}.part2
+
+fun solve(input: String): String {
+    return input
+}