Corner case problem

#1

i tried it to modify for inputs with 0, but it is generating extra outputs.
Please help.

#2

use if and else to control the recursion

    int digit = in[i] - '0';
    char ch = digit + 'A' - 1;
    if(digit == 0){
        generate_strings(in,out,i+1,j);
    }
    else {
        out[j] = ch;
        generate_strings(in,out,i+1,j+1);
    }

MOdified Code

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