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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.
haha yes, that could be a constraint
Of course, I agree with you that it's all your choice. I just wanted to say that I don't enjoy solving this kata in less than 1 minute without learning anything at all (luckily a method from the string api) and to create your own constraints is a way to make it more interesting.
I just don't understand why most of solutions are based on language specific properties. I understand katas as a way to improve the programming knowledge, this kata is awesome to practice any the famous sorting algorithms.