input: Write a function to multiply two input numbers and print the result.
  
  def multiply(a, b):
      result = a * b
      print(result)
      
  assert multiply(3, 4) == print(12)
  assert multiply(5, 6) == print(30)
  assert multiply(0, 0) == print(0)
  assert multiply(-1, -1) == print(1)
  assert multiply(1, 0) == print(0)
output: def multiply(a, b):
      result = a * b
      print(result)