Trust you are well, I apologize for asking a question that's been asked before but I've been stuck on this for a while without any luck and finally realized I need help.
I've attached my code of CS50 Caeser (Validating the key), how do I iterate through Isdigit in a string and not just a single character? I've tried using isalpha and ascii before isdigit but still not getting it right? Is my logic for validating the key right? Or is there another approach for completing ceaser? surely if you iterate through a string with isdigit and compile ceaser 20x it should print "Usage: ./caesar key" ? Please i'd appreciate any help.