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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.
It is not clear what should we return if Pete has less amount of ingredient than required. I assume it should return 0.
for example:
recipe-> sugar: 500
Pete-> sugar:200
Very clean solution. Well done!