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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
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I like the rigth away check for wolf being last before doind array manipulation or lookups. But I would change it to a
guard let queue.last != "wolf"else ...You could add 1 more guard at the beginning to check if there is a wolf in the array
guard let index = queue.lastIndex(of: "wolf") else ...