input: def positive_feedback_loop(iterations: int) -> None:
      """Design a positive feedback loop for the given python program.
      The program should print "hello" a specified number of times, and
      once the specified number of times is reached, it should print 
      a congratulatory message.
      >>> positive_feedback_loop(10)
      hello
      hello
      hello
      hello
      hello
      hello
      hello
      hello
      hello
      hello
      You've got it!
      """
      for i in range(iterations):
          print("hello")
          i += 1
          if i == iterations:
              print("You've got it!")
output:     for i in range(iterations):
          print("hello")
      print("You've got it!")