void runLuhn (int *ccNum, int *checksum)
{
    int i;
    int store;
    int total;

    i = 0;
    store = 0;
    total = 0;


    for(i = 0; i < 16; i = i + 2)
    {
        ccNum[i] = ccNum[i] * 2;
        store = (ccNum[i] / 10) + (ccNum[i] % 10);
        ccNum[i] = store;
    }
    for(i = 0; i < MAXCCNUM-1; i++)
    {
        total = total + ccNum[i];
    }

    printf("%d\n", total);

    *checksum = total % 10;
}