Put timestamp in file name if uploaded file already exists

src/files.rs

@@ -459,7 +459,10 @@ mod tests {
     #[test]
     fn directory_traversal_test() {
         let base = env::temp_dir();
-        assert_eq!(None, is_valid_full_path(&base, &PathBuf::from("../"), false));
+        assert_eq!(
+            None,
+            is_valid_full_path(&base, &PathBuf::from("../"), false)
+        );
         assert_eq!(None, is_valid_full_path(&base, &PathBuf::from(".."), false));
         assert_eq!(
             None,