fix StorageManager save, read expression and operation

fix create
fix export; not remove src space

run.py

@@ -383,7 +383,7 @@ class StorageManager:
     ) -> None:
         path = STORAGE_DIR / location / lang.value / ("completed" if completed else "")
         os.makedirs(path, exist_ok=True)
-        with open(f"{path}/{filename}", "wb") as f:
+        with open(path / f"{filename}.{lang.value}", "wb") as f:
             f.write(content)
 
     def read_file(self, location: str, lang: Language, filename: str) -> bytes:
@@ -392,8 +392,8 @@ class StorageManager:
             raise FileNotFoundError(
                 f"File not found in storage: {location}/{filename}.{lang.value}"
             )
-        file_path = f"{path}/{filename}"
+        file_path = path / f"{filename}.{lang.value}"
-        if not os.path.isfile(file_path):
+        if not file_path.is_file():
             raise FileNotFoundError(f"File not found in storage: {file_path}")
         with open(file_path, "rb") as f:
             return f.read()
@@ -586,7 +586,7 @@ def create(target: str, completed: bool, no_template: bool, force: bool):
             click.secho(f"Template not found: {template_path}", fg="yellow")
 
     StorageManager().save_file(
-        loc, lang, f"{filename}.{lang.value}", content, completed
+        loc, lang, filename, content, completed
     )
     click.secho(
         f"Created '{filename}.{lang.value}' in location '{loc}'",
@@ -768,7 +768,7 @@ def export(from_: tuple[str, ...], all_: bool, force: bool):
 
         with open(src_path, "rb") as f_src:
             content = f_src.read()
-
+        os.remove(src_path)
         StorageManager().save_file(
             s_loc, from_language, s_file, content, s_is_completed
         )