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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.
In which programming language? And where exactly?
Copy-paste of the test output makes it easier to see what is going on too.
Glancing over the test cases for all the programming languages, I see no errors as you describe. So more information is definitely required.