input: def double_numbers(start: int, end: int) -> None:
      """Prints out every number from start to end (inclusive) with each number being multiplied by 2.
      >>> double_numbers(0, 10)
      0
      2
      4
      6
      8
      10
      12
      14
      16
      18
      20
      """
      for i in range(start, end + 1):
          print(i * 2)
output:     for i in range(start, end + 1):
          print(i * 2)