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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.
May I suggest removing
return str;from the solution template? The suggestion that specificallystrshould be the return value could be slightly confusing, when its not really a requirement.Another thank you from here as well. Test case should be showing in this one.