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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.
That's what the 'if s' conditional determines, as an empty string '' s evaluates to not s
First of allm as other comment says, it wont work as spected.
Second, What if S is just a white space?
it also wont work if the string is a white space... it will just return the hashtag symbol