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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.
Just did it on kotlin everything is correct.
The 3rd sample test is wrong. Should return 12 instead of 20. I spent a few hours just to understand it. I hope it will be fixed. Generally this kata was really interesing! Thank you author :)
This is actually flawlessly solution!
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