oid MergeSort(Tasks **headRef){
    Tasks *head = *headRef;
    Tasks *a;
    Tasks *b;

    if ((head == NULL) || (head->Next == NULL))
    {
        return;
    }
    Split(head, &a, &b);

    MergeSort(&a);
    MergeSort(&b);

    *headRef = SortedMerge(a, b);
}

Tasks *SortedMerge(Tasks *a, Tasks *b){
    Tasks *result = NULL;

    if (a == NULL)
        return(b);
    else if (b==NULL)
        return(a);

    if (a->hour < b->hour)
    {
        result = a;
        result->Next = SortedMerge(a->Next, b);
    }
    else if (a->hour > b->hour)
    {
        result = b;
        result->Next = SortedMerge(a, b->Next);
    }
    else
    {
        if (a->minutes < b->minutes)
        {
            result = a;
            result->Next = SortedMerge(a->Next, b);
        }
        if (a->minutes > b->minutes)
        {
            result = b;
            result->Next = SortedMerge(a, b->Next);
        }
    }
    return(result);
}

void Split(Tasks *source, Tasks **frontRef, Tasks **backRef)
{
    Tasks *fast;
    Tasks *slow;
    if (source==NULL || source->Next==NULL)
    {
        *frontRef = source;
        *backRef = NULL;
    }
    else
    {
        slow = source;
        fast = source->Next;

        while (fast != NULL)
        {
            fast = fast->Next;
            if (fast != NULL)
            {
                slow = slow->Next;
                fast = fast->Next;
            }
        }

        *frontRef = source;
        *backRef = slow->Next;
        slow->Next = NULL;
    }
}