Can I get a feedback on my code?

[GRCK5000]

I'm filling out an array with letters (from A to Z). Please run the code and see the behavior. I want my code to work as it's working now. What do you think about what I'm doing? Is it good or bad?

Feel to criticize. 

[altenbach]

Bad! Way too much duplicate code and unnecessary complications! You are also indexing outside the valid array later.

[altenbach]

See if this can give you some ideas:

[altenbach · Accepted solution]

Here's what I would probably do (make sure to learn about the output configuration of the addition. Needs to be U8):

[GRCK5000]

Wow. Next time, Thanks Mr. Altenbach. So, now I learned to avoid duplication, I should be using for loop. Thanks!!! You made this very simple. Awesome!!!