void PersonList::Remove(Person * person)
{
    int index = IndexOf(person);
    if (index == 0)
    {
        if (_head != nullptr)
        {
            PersonListItem * pTmpPointer = _head;
            _head = _head->NextItem;
            _head->PrevItem = nullptr;
            delete pTmpPointer;
            _count--;
        }
    } else
    if (index == _count-1)
    {
        PersonListItem* currentItem = _head;
        for (int i = 1; i <= _count-1; i++)
        {
            currentItem = currentItem->NextItem;
        }
        PersonListItem* currentTmpItem = currentItem;
        currentItem = currentItem->PrevItem;
        currentItem->NextItem = nullptr;
        delete currentTmpItem;
        _count--;
    }
    else
    if (index >0)
    {
        PersonListItem* currentItem = _head;
        for (int i = 1; i <=index; i++)
        {
            currentItem = currentItem->NextItem;
        }
        PersonListItem* currentTmpItem = currentItem;
        currentItem->NextItem->PrevItem = currentItem->PrevItem;
        currentItem->PrevItem->NextItem = currentItem->NextItem;
        delete currentTmpItem;
        _count--;
    }
}