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std::string sortedList::printList() const{
    std::string print{};
    Node* currentNode = first;

    if (this->isEmpty()){
        print = "NULL.";
    } else {
        for (int i=0; i<size; i++)
        {

            if (i==size-1){ //Last iteration
                print += std::to_string(currentNode->value) + " -> NULL.";
            } else {
                print += std::to_string(currentNode->value) + " -> ";
            }
            currentNode = currentNode->next;
        }
    }
    return print;
} //prints the existing nodes