chore: monitor structure of the project (#6291)

.github/workflows/project_structure.yml

@@ -0,0 +1,22 @@
+---
+name: ProjectStructure
+
+'on':
+  workflow_dispatch:
+  push:
+    branches:
+      - master
+  pull_request:
+
+jobs:
+  check_structure:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: '3.13'
+
+      - name: Check project structure
+        run: python3 .github/workflows/scripts/check_structure.py
+...

.github/workflows/scripts/check_structure.py

@@ -0,0 +1,27 @@
+import pathlib
+import sys
+
+
+def _is_java_file_properly_located(java_file: pathlib.Path) -> bool:
+    main_parents = java_file.parent.parents
+    return (
+        pathlib.Path("src/main/java/com/thealgorithms/") in main_parents
+        or pathlib.Path("src/test/java/com/thealgorithms/") in main_parents
+    )
+
+
+def _find_misplaced_java_files() -> list[pathlib.Path]:
+    return [
+        java_file
+        for java_file in pathlib.Path(".").rglob("*.java")
+        if not _is_java_file_properly_located(java_file)
+    ]
+
+
+if __name__ == "__main__":
+    misplaced_files = _find_misplaced_java_files()
+    if misplaced_files:
+        print("The following java files are not located in the correct directory:")
+        for _ in misplaced_files:
+            print(_)
+        sys.exit(1)