refactor: suppress unused variable warning by renaming parameter to _f

src/tests.rs

@@ -35,7 +35,7 @@ mod tests {
     }
 
     // Helper function to create test items with specific content and tags
-    fn create_test_items<F>(dir: &Path, f: F)
+    fn create_test_items<F>(dir: &Path, _f: F)
     where
         F: FnOnce(&str, &str),
     {