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)==12
  assert multiply(5, -2)==-10
  assert multiply(0, 10)==0
  assert multiply(-3, -3)==9
  assert multiply(1, 1)==1
output: def multiply(a, b):
      result = a * b
      print(result)