Well, if you mean my code it consist of 2 functions:
First I create an array of floating point numerics, that start at 65 runs to 90 with 26 elements. Second I convert it into a string of ASCII.
If you mean Altenbach's first code segment:
This runs in a for loop that runs 26 tims.
It takes the iteration number, convert it into an 1 byte unsigned integer, adds 65 (A in ASCII) and converts the data type from U8 to string.
At the end of the for loop the data is auto-indexed into an array of strings.
Altenbach's second code is a variation on this using a shift register.
Try for yourself to create a fourth method!
Ton