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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.
Please read this: https://docs.codewars.com/getting-started/solving-kata and this: https://docs.codewars.com/training/training-example There is no bug in the website, your code isn't right because it's not returning anything. Mark your post as having spoiler content next time.