week 3 challenge - bio_putint(int val)

My result as below, has been test.
void sep(int val)
{
    int i;
    if (val/10)
    {
        i = val % 10;
        sep(val/10);
    }
    else
        i = val % 10;
    _putch(i?i+48:48);
}
void bio_putint(int val)
{
    sep(val);
}