checkpoint dealing with personal manager/editor

src/diff_viewer.py

@@ -1,4 +1,4 @@
-from typing import List, Dict, Optional, Tuple
+from typing import List, Dict, Optional, Tuple
 from dataclasses import dataclass
 import shutil
 import os
@@ -217,4 +217,4 @@ def restore_from_backup(file_path: str) -> bool:
 def cleanup_backup(file_path: str) -> None:
   backup_path = Path(str(file_path) + ".backup")
   if backup_path.exists():
-    backup_path.unlink()
+    backup_path.unlink()