CS50x Coding Contest 2016 - Name Your Cat

catname.c

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

#include "cs50.h"

int main(void)
{
    int n = GetInt();
    string s = GetString();
    int i = 0;
    int j = 1;
    
    while (i < (n-j))
    {
        if (s[i] == 'a' || s[i] == 'c' || s[i] == 'e' || s[i] == 'i' || s[i] == 'k' || s[i] == 'n' || s[i] == 't')
        {
            if (s[n-j] == 'a' || s[n-j] == 'c' || s[n-j] == 'e' || s[n-j] == 'i' || s[n-j] == 'k' || s[n-j] == 'n' || s[n-j] == 't')
            {
                //swap
                char temp = s[i];
                s[i] = s[n-j];
                s[n-j] = temp;
                i++;
                j++;
            }
            else
            {
                //incrememnt j if we don't swap to find next viable char
                j++;
            }
        }  
    else
        i++;
    }
    printf("%s", s);
}