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How do I write the body of this function?

def add_mention_exclusive(tweet: str, tweetword: str)

-> str: 

  """ Add the '@' symbol to tweetword contained in tweet. If

  tweetword already has a '@' symbol before it in tweet, return tweet. 


  >>>add_mention_exclusive('I love Wendys', 'Wendys')

  'I love @Wendys'

  >>>add_mention_exclusive('I love @Wendys', 'Wendys')

  'I love @Wendys'


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