[O] Make directories constant

src/utils.py

@@ -59,28 +59,6 @@ def debug(msg: object) -> None:
     print(f'[DEBUG] {caller}: {msg}')
 
 
-def normalize_directory(directory: str) -> str:
-    """
-    Normalize a directory input: Ensure that the directory doesn't end with "/", and ensure that an
-    empty directory input will be relative (".")
-
-    >>> normalize_directory('')
-    '.'
-    >>> normalize_directory('path/')
-    'path'
-    >>> normalize_directory('path')
-    'path'
-
-    :param directory: Input directory
-    :return: Normalized directory
-    """
-    if directory == '':
-        directory = '.'
-    if directory.endswith('/'):
-        directory = directory[:-1]
-    return directory
-
-
 def calculate_rate_delay(rate_limit: float) -> float:
     """
     Calculate the rate delay for each request given rate limit in request per minute