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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.
Does not work with "step-daughter" test case.
In Go implementation we are asked to return string, but actually tests check for byte array, so if you work with strings in your solution, you'll get working program which can't pass through the tests.
To complete this Kata we need to create byte array, then convert it to string, pass it to tests, which convert our string to byte array. This is a little bit dumb.