docs: def unpad_aes256(s):
      """
      Removes padding from an input string based on a given block size.
      :param s: string
      :returns: The unpadded string.
      """
      if not s:
          return s
  
      try:
          return Padding.removePadding(s, blocksize=AES.block_size)
      except AssertionError:
          # if there's an error while removing padding, just return s.
          return s