input: Write a function to reverse the order of words in a given string. The function should take a string as input and return a new string with the words in reverse order. If the input string is empty, the function should return an empty string.
  assert reverse_words("Hello World") == "World Hello"
  assert reverse_words("Python is fun") == "fun is Python"
  assert reverse_words("") == ""
  assert reverse_words("One word") == "word One"
  assert reverse_words("   Multiple spaces  ") == "  spaces Multiple"
output: def reverse_words(s):
      words = s.split()
      reversed_words = words[::-1]
      return ' '.join(reversed_words)