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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.
Your function should return the first non-repeated char of the string, so, if the string has only 1 char, it should return that one. It's not repeated, is it? At least I think that's the way of understanding it.
What are you saying there?
'a'is not repeated, so, yes,dups('a') => ''of course.