Arduino-based Three Letter Word generator issues.

I have begun an Arduino-based project that is something like a game - it generates random three-letter words and prompts the user for feedback on the existence of each word. However, I seem to be caught in a roadblock, as I can’t seem to find a way around a particular issue with the code (raised already in the GitHub repo).

I’ll provide the GitHub link.

Any help would be appreciated.

Cheers in advance.

GitHub repo:

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...R