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You have a structural problem. You're trying to create main(), followed by a function called is_valid_key), but you have some errors in how you did it. The main() function (yes, it's technically a function, with a special name) should end with a closing curly brace, before the start of any other functions. This code has the closing curly brace at the very ...


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Look at this line: for (int i = 0; i < strlen(argv[i]); i++) Here you're trying to iterate over all arguments in the command line when you should iterate only over the second argument. To fix this you can create a variable: string x = argv[1]; for (int i = 0; i < strlen(x); i++) or use the address: for (int i = 0; i < strlen(&argv[1][i]); i++)...


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