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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 use spoiler flag next time.
A problem with your code not working is not a kata issue. This kata has been solved by thousands of users in C# (I guess it's the language you're using?). See if this can help: Troubleshooting Your Solution.