not working yet

#include <unistd.h>
#include <stdio.h>





int ft_putchar(char c)
{
    write (1, &c, 1);
    return 0;
}



void ft_putnbr(int nb)
{
    while (((nb % 10) != 0) || (nb >= 10))
    {
        ft_putchar ((nb % 10) + '0');
        nb = nb / 10;
    }
}

int     ft_reverse(int nb)
{
    int res;
    while (nb > 0)
    {
        res = ((nb % 10) * 10) + (nb % 10) % 10;
        nb = res;
    }
    return (res);
}


int     main()
{
    int a;
    scanf("%d", &a);
    ft_putnbr(ft_reverse(a));
    return 0;
}