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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.
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Added test to handle array[n] being 0. This will correctly fail solutions that uses || to fallback to -1.
There should be test cases involving drinks of more than 9 (i.e more than one digit). Example:
hydrate("11 shot, 1 beers") shoudld return '12 glasses of water'
Some solutions I saw returns '3 glasses of water' because '11' was treated as '1' and '1'.