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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.
The best solution would probably be to permanently associate a solution with a language version but I guess they didn't go woth that.
I can't speak for others, but if I recall correctly I submitted this solution around 2016 or 2017 when codewars was using an ancient version of elixir (something like 1.2). Obviously you would not use String.strip with 1.9 because it doesn't exist.