Booking **bookingSelectPaid(Booking **booking)
{
    Booking **ret = malloc(sizeof(Booking*));
    size_t i = 0;
    int numOfPaid = 0;
    while (booking[i] != NULL)
    {
        if (booking[i]->paid == 1)
        {
            ++numOfPaid;
            size_t newsize = sizeof(Booking*) * (numOfPaid + 1); ret = realloc(ret, newsize);
            ret[i] = booking[i];
            ret[i+1] = NULL;
        }
        ++i;
    }
    return ret;
}