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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.
Your solution has a bug and does not handle some inputs correctly. If you take a look at results of failed tets you will see that it fails "Edge cases" section. What edge cases did you test in console?
Buggy solutions are not a kata issue.