It's not the most elegant solution, but you could try one of the following substring methods when your string has a fixed length,

https://www.programmingsimplified.com/c/source-code/c-substring

You understand it right!

Grant: yeah, the problem is that the length is not fixed. I hoped this to be easier (like in C) but doesn't matter, I fight with it. That is the easiest part of the program, the debugging both visually and by values are more pain in the ass.

Thanks for both of your help and have a nice day!

Within Excel I use the LEN() and MID() functions for a similar scenario with non-fixed string lengths, but in your case I believe it would be much easier to work with an array.
Best of luck and have a nice day as well.

Later on I will check your idea! Thanks!