input: Write a function to design a positive feedback loop for the given Python program. The function should modify the original program by adding a feedback mechanism that prints a congratulatory message when the loop completes. If the input is empty, the function should return the original empty input.
  assert positive_feedback_loop("for i in range(10):\n    print(\"hello\")") == "for i in range(10):\n    print(\"hello\")\n    i += 1\n    if i == 10:\n        print(\"You've got it!\")"
  assert positive_feedback_loop("") == ""
  assert positive_feedback_loop("for i in range(5):\n    print(i)") == "for i in range(5):\n    print(i)\n    i += 1\n    if i == 10:\n        print(\"You've got it!\")"
  assert positive_feedback_loop("for i in range(7):\n    print(\"hi\")") == "for i in range(7):\n    print(\"hi\")\n    i += 1\n    if i == 10:\n        print(\"You've got it!\")"
  assert positive_feedback_loop("for i in range(0):\n    print(\"bye\")") == "for i in range(0):\n    print(\"bye\")\n    i += 1\n    if i == 10:\n        print(\"You've got it!\")"
output: def positive_feedback_loop(code):
      if not code:
          return code
      return code + "\n    i += 1\n    if i == 10:\n        print(\"You've got it!\")"