input: Write a function that takes two numbers as parameters, adds them together, and prints the result.
  
  def add(a, b):
      sum = a + b
      print(sum)
  
  assert add(5, 7) == None
  assert add(10, -3) == None
  assert add(0, 0) == None
  assert add(-5, -5) == None
  assert add(2.5, 2.5) == None
output: def add(a, b):
      sum = a + b
      print(sum)