input: Write a python function to encrypt a message using Caesar cipher.
  assert caesar_encrypt("hello", 3) == "khoor"
  assert caesar_encrypt("xyz", 3) == "{|}"
  assert caesar_encrypt("abc", 1) == "bcd"
  assert caesar_encrypt("ABC", 2) == "CDE"
output: def caesar_encrypt(message, shift):
      encrypted_message = ""
      for char in message:
          encrypted_message += chr(ord(char) + shift)
      return encrypted_message