int     my_power_rec(int nb, int power)
{
  if (power == 1)
    return (nb);
 if (power < 0)
    return (0);
 if (power == 0)
   {
     nb = 1;
     return (nb);
   }
 if (power > 1)
    return (nb * my_power_rec(nb, power - 1));
}