input: def list_directory_contents(directory_path: str) -> None:
      """
      Lists the contents of the specified directory. If no directory is specified,
      it lists the contents of the current directory.
      
      >>> list_directory_contents('')
      (prints the contents of the current directory)
      >>> list_directory_contents('/path/to/directory')
      (prints the contents of the specified directory)
      """
      import os
      directory_contents = os.listdir(directory_path)
      for content in directory_contents:
          print(content)
output:     import os
      directory_contents = os.listdir(directory_path)
      for content in directory_contents:
          print(content)