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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.
You're doing something wrong in your code, not a kata issue. 24 is not the size of the vector, read the docs: https://www.tutorialspoint.com/cplusplus/cpp_sizeof_operator.htm
You cannot append characters to a string like this in C++. You should read the documentation or look on some forums. A single google research with the name of your language and the keywords of what you are trying to do will give you everything you need. Next time, please use markdown tags to format your code, otherwise it is not readable; see there: https://docs.codewars.com/training/troubleshooting/#post-discourse
That's a problem with your code, not a kata issue, please read this: https://docs.codewars.com/training/troubleshooting/
Check the limits of your loops.