dyn_arr_expand

int *expand(int *arr, int *new_size, int *max_size)
{
    int *tmp;
    *max_size = (int) *new_max_size * 1.2;
    tmp = realoc(arr, sizeof(int) * (max_size);
    if (!tmp)
        return NULL;

    return tmp;
}

void remove(int *arr)
{
    free(arr);
}

int *fit(int *arr, int *actual_size)
{
    int *tmp;
    tmp = realoc(arr, sizeof(int) * (*actual_size));
    if (!tmp)
        return NULL;

    return tmp;
}