input: Write a function to modify the given Python program so that it prints 'Happy Holidays' 10 times instead of 'Hello World'.
  
  assert modify_holiday_greeting("for i in range(10):\n    print('Hello World')")\n    .strip() == "for i in range(10):\n    print('Happy Holidays')"
output: def modify_holiday_greeting(code):
      return code.replace("Hello World", "Happy Holidays")