Tri par insertion en C

void
selection_sort(void *vector[], int length, int (*less)(void *, void *))
{
  for (int k = 1; k < length; k++)
    {
      void *temp = vector[k];
      int i;
      for (i = k - 1; i >= 0; i--)
        {
          if (less(temp, vector[i]))
            break;
          vector[i + 1] = vector[i];
        }
      vector[i + 1] = temp;
    }
}