diff --git a/src/clew/clew.py b/src/clew/clew.py
index 511e4f4..fb27fc5 100644
--- a/src/clew/clew.py
+++ b/src/clew/clew.py
@@ -84,15 +84,7 @@ def extract_game_files(game_root: Path, output_path: Path) -> None:
             shutil.copy2(item, destination)
 
 
-def is_game_root(path: Path) -> bool:
-    return (
-        (path / "game").is_dir()
-        and (path / "renpy").is_dir()
-        and (path / "lib" / "linux-x86_64" / "python").is_file()
-    )
-
-
-def walk_directory(root: Path, predicate) -> list[Path]:
+def matching_paths(root: Path, predicate) -> list[Path]:
     matches = []
     for current, _directories, files in os.walk(root):
         current_path = Path(current)
@@ -105,10 +97,6 @@ def walk_directory(root: Path, predicate) -> list[Path]:
     return sorted(matches)
 
 
-def is_compiled_script(path: Path) -> bool:
-    return path.is_file() and path.suffix.lower() in {".rpyc", ".rpymc"}
-
-
 def object_dump_output_path(output_root: Path, extracted_root: Path, game_root: Path, script: Path) -> Path:
     namespace = game_root.relative_to(extracted_root)
     relative_script = script.relative_to(game_root)
@@ -134,13 +122,23 @@ def run_renpy_object_dump(game_root: Path, script: Path, output: Path) -> None:
 
 
 def dump_renpy_objects(output_root: Path, extracted_root: Path, overwrite: bool) -> None:
-    game_roots = walk_directory(extracted_root, is_game_root)
+    game_roots = matching_paths(
+        extracted_root,
+        lambda path: (
+            (path / "game").is_dir()
+            and (path / "renpy").is_dir()
+            and (path / "lib" / "linux-x86_64" / "python").is_file()
+        ),
+    )
     if not game_roots:
         LOG.warning("no Ren'Py game roots found under %s", extracted_root)
         return
 
     for game_root in game_roots:
-        scripts = walk_directory(game_root / "game", is_compiled_script)
+        scripts = matching_paths(
+            game_root / "game",
+            lambda path: path.is_file() and path.suffix.lower() in {".rpyc", ".rpymc"},
+        )
         LOG.info("found %d compiled Ren'Py scripts under %s", len(scripts), game_root)
         total = len(scripts)
         for index, script in enumerate(scripts, start=1):