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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.
This is not the proper way to raise an issue. You must prove there is an issue with clear logs, examples, etc. About 200 persons solved this kata in Kotlin and nobody reported anything so you're most probably wrong. Please read this and don't raise issues so lightly in the future: https://docs.codewars.com/training/troubleshooting/