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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. It works incorrectly when it is called more than once. Test it locally bu running it two times in a row, once with input "abcdefghijklmnopqrstuvw", and then with input "xyz".
It is a bug in your solution, and not a kata issue.
Sorry, there are no errors in the tests. (C kata passed by 883 people).
And what is the issue here? Your solution returns wrong results.