struct Node
{
    int const value;
    Node* next;
};

int main()
{
    Node* curr { new Node { 1, new Node { 2, new Node { 3, nullptr } } } };

    Node* tmp { curr->next };
    curr->next = tmp->next;
    delete tmp;

    tmp = curr->next;
    tmp->next = new Node { 4, nullptr };

    while (curr != nullptr)
    {
        tmp = curr;
        curr = curr->next;
        delete tmp;
    }
}