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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.
This also will have some issues no? For example if I put "!!!" at the end it will return wrong string. Even with only "!" at the end or any single character for that matter, You forgot to put the character back, 'if(el.length > 1)' will simply skip the single character :)