SingularLinkedList::~SingularLinkedList(){
    Node *support;
    int numberOfNodes = getNumberOfNodes();
    temp = head;
    support = temp;
    for(int i = 0; i < numberOfNodes; i++){
        temp = temp->getNext();
        std::cout<<"Node: "<<support->getKey()<<" deleted"<<std::endl;
        delete support;
        support = temp;
    }
    delete temp;
    std::cout<<"List deleted"<<std::endl;
}