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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.
The description has been rewritten and the examples have been replaced to be clearer. If you don't have any questions, please, close the issue.
Say you've got the string "abcdefgh".
Take the even-numbered characters (2, 4, 6, 8): "bdfh"
Take the characters that are left over: "aceg"
Put them together: "bdfhaceg"
No, your code is different, you should rearrange your code to calculate the error count before using it to build the string.