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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.
I honestly think it's quite an "odd" idea to move this kata to Kotlin (and other languages too) as it completely relies on Java functionality. This is not a Kotlin kata.