input: Write a python function to encrypt a given plaintext using AES in ECB mode.
  assert aes_ecb_encrypt("This is a secret message", b"Sixteen Byte Key") == "c3a40f3dce503efa1f00561d60e579b9"
  assert aes_ecb_encrypt("Another secret", b"Sixteen Byte Key") != "c3a40f3dce503efa1f00561d60e579b9"
output: from Crypto.Cipher import AES
  from Crypto.Util.Padding import pad
  import binascii
  
  def aes_ecb_encrypt(plaintext, key):
      cipher = AES.new(key, AES.MODE_ECB)
      padded_text = pad(plaintext.encode('utf-8'), AES.block_size)
      encrypted_text = cipher.encrypt(padded_text)
      return binascii.hexlify(encrypted_text).decode('utf-8')