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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.
You also forgot the random tests. This was 2017, no longer 2013.
I'm not about to fix that for Yet Another Evaluate-My-Expression Kata, but it would have been really rather trivial.
I won't bother OP with a downvote, but the translation deserves it.
Not approvable yet: you forgot the sample tests