input: Write a function to design a positive feedback loop for the given Python program. The loop should increment the variable `i` and print "hello" each iteration. Once `i` reaches 10, it should print "You've got it!" and stop. The function should take no input parameters and return the modified loop as a string.
  
  assert positive_feedback_loop() == \
  "for i in range(10):\n    print('hello')\n    i += 1\n    if i == 10:\n        print('You've got it!')"
  
output: def positive_feedback_loop():
      loop = ""
      for i in range(10):
          loop += "    print('hello')\n"
          loop += "    i += 1\n"
          if i == 9:
              loop += "    print('You've got it!')\n"
      return loop