input: def multiply(a: int, b: int) -> None:
      """Multiplies two integers and prints the result.
      
      >>> multiply(3, 4)
      12
      >>> multiply(0, 5)
      0
      >>> multiply(-2, -2)
      4
      """
      result = a * b
      print(result)
output:     result = a * b
      print(result)