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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.
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What if there are multiple first characters in string? Then this fails, for example to compare shiftedDiff("fofe","ofef")
Here each time new String is created, Stringbuilder could be more efficient from resource perspective.