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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.
It uses // instead of # for comments in the Ruby version
There needs to be some test provided by default for this Kata
There is a test where the test where an array of nulls is appearing, there is no test case for this. Have the author add in a use case for the array of nulls in order for the user to test in all cases.