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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.
Random tests is also missing.
Requiring people to store previous run's result just because the tests keep using the same set of items as input is... insane and utterly ridiculous.
This is a duplicate of https://www.codewars.com/kata/58296c407da141e2c7000271.