input: Write a function that takes two input numbers, multiplies them, and prints the result. The function should be named `multiply` and should take two parameters `a` and `b`. The function should print the result of `a * b`.
  
  assert multiply(3, 4) == None
  assert multiply(5, 7) == None
  assert multiply(0, 8) == None
  assert multiply(2, 2) == None
  assert multiply(-1, -1) == None
output: def multiply(a, b):
      print(a * b)