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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.
This is true! :)
Yeah,it's not tolerable for a perfectionist.
Great work, but I will share my caveats :) This may look very fast, but you have to go throught whole array (sum function), this is time consuming, also in some languages you may reach out of range for integers.
You have duplicated code, I think. In my opinion new function get_palindrome_number would be cleaner and easier to read.