input: from typing import Tuple
  from Crypto.Cipher import AES
  
  def encrypt_decrypt_message(key: bytes, message: str) -> Tuple[bytes, bytes]:
      """ Encrypts and decrypts a given message using the AES algorithm in ECB mode.
      Returns a tuple with the encrypted message and the decrypted message.
      >>> encrypt_decrypt_message(b'Sixteen byte key', 'Hello World!')
      (b'x\x82\xfb\xdc\xd3\x8f+\xb1\xcf\xa7V\xa4U\xd2\xf2w', b'Hello World!')
      """
      cipher = AES.new(key, AES.MODE_ECB)
      encrypted_message = cipher.encrypt(message)
      decrypted_message = cipher.decrypt(encrypted_message)
      return encrypted_message, decrypted_message
output:     cipher = AES.new(key, AES.MODE_ECB)
      padded_message = message.encode().ljust(16, b'\0')
      encrypted_message = cipher.encrypt(padded_message)
      decrypted_message = cipher.decrypt(encrypted_message).rstrip(b'\0').decode()
      return encrypted_message, decrypted_message