multiplie linked list numbers, C++ (vc++)

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//Title of this code

#include <iostream>

using namespace std;

struct node {
    int data;
    node* next;
    
    node(int d, node* n): data(d), next(n) {}
};

node* reverse(node* head) {
    node* current = head;
    node* next;
    node* prev = NULL;
    
    while (current != NULL) {
       next  = current->next;
       current->next = prev;
       prev = current;
       current = next;
    }
    
    return prev;
}

node* multiply(node* head1, node* head2) {

node* ret = new node(0, NULL);
    node* res = ret;
    node* curRes = ret;

node* num1 = head1;
    while (num1) {

curRes = res;
        
        int carry = 0;
        node* num2 = head2;
        while (num2) {
        
            curRes->data += carry + (num1->data * num2->data);
            if (curRes->data > 9) {
                carry = curRes->data / 10;
                curRes->data = curRes->data % 10;
            } else
                carry = 0;

if (!curRes->next)
                curRes->next = new node(0, NULL);
            curRes = curRes->next;

num2 = num2->next;
        }
        
        if (carry > 0)
            curRes->data += carry;
                    
        num1 = num1->next;
        res = res->next;
    }
 
    ret = reverse(ret);
    if (ret->data == 0) {
        res = ret->next;
        delete ret;
        ret = res;
    }

return ret;
}

void printList(node* head) {
 
    while (head) {
        cout << head->data << "";
        head = head->next;
    }
}

int main()
{
    node* num1 = new node(9, new node(9, new node(5, new node(9, new node(4, new node(7, NULL))))));
    node* num2 = new node(9, new node(7, new node(4, new node(8, new node(9, NULL)))));

printList(num1);
    cout << " * ";
    printList(num2);
    cout << " = ";
    
    node* numRes = multiply(reverse(num1), reverse(num2));
    
    
    printList(numRes);

}

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Compilation time: 1.18 sec, absolute running time: 0.05 sec, absolute service time: 1.23 sec