input: Write a function to design a positive feedback loop for the given Python program. The function should return the modified program as a string.
  
  def positive_feedback_loop(program_code):
      lines = program_code.strip().splitlines()
      if len(lines) != 2:
          return "Invalid input program"
      return "\n".join([lines[0], lines[1] + "\n    i += 1\n    if i == 10:\n        print(\"You've got it!\")"])
  
  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!\")"
output: def positive_feedback_loop(program_code):
      lines = program_code.strip().splitlines()
      if len(lines) != 2:
          return "Invalid input program"
      return "\n".join([lines[0], lines[1] + "\n    i += 1\n    if i == 10:\n        print(\"You've got it!\")"])