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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.
the problem is the piecemeal allocations, maybe the runtime will make it not terrible,
but im sure not relying on that for hot code.
however i agree with how clean it is, i need to reach that level of iterator wizardry.
and if you could pre allocate the String vec then is not a issue
but then in this specific case simple concatenation in a big string would end being simpler.