input: Write a function to design a positive feedback loop for the given Python program. The function should modify the original program to provide positive feedback when the loop completes. If the loop completes successfully, the program should print "You've got it!". The function should return the modified Python code as a string.
  
  assert design_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 design_feedback_loop("for i in range(5):\n    print('world')")=="""for i in range(5):\n    print('world')\n    i += 1\n    if i == 5:\n        print('You've got it!')"""
  assert design_feedback_loop("")=="""if i == 10:\n    print('You've got it!')"""
  assert design_feedback_loop("for i in range(2):\n    print('hi')")=="""for i in range(2):\n    print('hi')\n    i += 1\n    if i == 2:\n        print('You've got it!')"""
  assert design_feedback_loop("for i in range(3):\n    print('bye')")=="""for i in range(3):\n    print('bye')\n    i += 1\n    if i == 3:\n        print('You've got it!')"""
output: def design_feedback_loop(code):
      if "for i in range(" in code:
          loop_end = code[code.find("(")+1:code.find(")")]
          return f"{code}\n    i += 1\n    if i == {loop_end}:\n        print('You've got it!')"
      else:
          return "if i == 10:\n    print('You've got it!')"