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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.
It's not an issue and not a subject for a fix.
When you print, tests cannot know what is your answer and cannot verify your answer for correctness. You have to return answers from your functions, it's by design. Tests cannot read screen.