Loading collection data...
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.
thats not really efficient, you has to create new string r every your loop iteration. It will be much better to use strings.Builder instead
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For those, who will try to solve it - just return a new array, do not replace elements in-place(not in-place algorithm)