input: Write a python function to sort a list of strings alphabetically and join them into a single string with spaces in between.
  assert alphabetize_list(['apple', 'banana', 'orange']) == 'apple banana orange'
  assert alphabetize_list(['dog', 'cat', 'elephant', 'bat']) == 'bat cat dog elephant'
  assert alphabetize_list(['zebra', 'monkey', 'lion']) == 'lion monkey zebra'
output: def alphabetize_list(words):
      return ' '.join(sorted(words))