Pwnium.c

altered-solution.c

#include <ctype.h>
#include <string.h>
#include <stdio.h> 

char secret_code[] = "B1lR]c5r]Qsqfg"; 

void alter_digit(char *s)
{
    for (int i = 0; i < strlen(s); ++i)
    {
        if (isdigit(s[i]))
        {
            int x = 10;
//            x += 4 * 3;
            x -= 7;
            s[i] = s[i] ^ x;
        }
    }
} 

void rotate(char *s)
{
    char aux;
    int n = strlen(s);
    for (int i = 0; i < n / 2; ++i)
    {
        aux = s[i];
        s[i] = s[n - i - 1];
        s[n - i - 1] = aux;
    }
}
int main(int argc, char const *argv[])
{
//    rotate(secret_code);
    for (int i = 0; i < strlen(secret_code); ++i)
    {
//        if (i % 2 == 0)
//            secret_code[i] -= 2;
//        else
            secret_code[i] += 2;
    } 

    alter_digit(secret_code);
    puts(secret_code);
    return 0;
}