input: 
  def auto_complete(dictionary, prefix):
      """Given a list of words and a prefix, returns a list of words that start with the given prefix.
      >>> auto_complete(['dog', 'deer', 'deal', 'dungeon', 'dark', 'dusk'], 'd')
      ['dog', 'deer', 'deal', 'dungeon', 'dark', 'dusk']
      >>> auto_complete(['car', 'cat', 'care', 'cart'], 'ca')
      ['car', 'cat', 'care', 'cart']
      """
      prefix_words = []
      for word in dictionary:
          if word.startswith(prefix):
              prefix_words.append(word)
      return prefix_words
  
output:     prefix_words = []
      for word in dictionary:
          if word.startswith(prefix):
              prefix_words.append(word)
      return prefix_words