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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 a spoiler flag when you post code somewhere. More help and important details there: https://docs.codewars.com/training/troubleshooting/
One can see in the tests logs that your code doesn't work with odd length strings.