input: Write a function to add two numbers and then double the result. The function should take two arguments and return the final result.
  
  def double_add(num1, num2): 
      return (num1 + num2) * 2
  
  assert double_add(2, 3) == 10
  assert double_add(5, 7) == 24
  assert double_add(-1, 1) == 0
  assert double_add(0, 0) == 0
  assert double_add(10, -5) == 10
output: def double_add(num1, num2): 
      return (num1 + num2) * 2