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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.
I am facing the same issue. And definitely Maskell is talking about JavaScript. Can you tell me how to replace a character according to index.
It's impossible to help you if we don't know which language you're using, and how you're using replace().
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