input: def auto_complete(dictionary, prefix):
      """This function takes in a list of words (dictionary) and a prefix (string). 
      It 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(['dog', 'deer', 'deal', 'dungeon', 'dark', 'dusk'], 'de')
      ['deer', 'deal']
      """
output:     return [word for word in dictionary if word.startswith(prefix)]