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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.
NO
indexofis a loop-alike method, so your code is O(n2)if you wanna code in c# I would recommend not to use the String.Replace() method.The String.Replace() method replaces all occurences and cannot be specified with a count as an Argument. There is no overload of that method that takes that argument. So avoid that method, it won't get you far.
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what's some of the techniques you used?