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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.
Nice solution! however it works when the input only has two characters "(" and ")", your ternary conditional should be more specified, also it's inefficient the use of "parens.length" within bucle, but beyond that I like it especially the use of "indent>=0" within bucle.