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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.
Dunno if you still care, but your code is timing out on single character inputs.
For whatever reason, on codewars inputs default to 255.
So for an input of a\0 you start with [97] [0] [255]
and your code just keeps copying cell 3 to cell 2 cause it never hits the EOF marker.