Write C++ code

There are two linked lists A and B containing integers. Write a friend function of LinkedList class to create and return a new linked list that contains only those elements that are common in linked lists A and B

LinkedList commonElements(LinkedList A, LinkedList B)

{

}

Use this linked list code

#include 

using namespace std;

template 

class Node {

public:

    T info;

    Node *next;

    Node(T data) {

        next = NULL;

        info = data;

    }

};

template 

class LinkedList {

private:

    Node *start;

public: 

    LinkedList(){

        start = NULL;

    }

    void print(){

        Node *curr = start;

        while (curr != NULL)

        {

            cout
            curr = curr -> next;
        }
        cout<
    }
    void insertToFront(T data) {
        Node *newNode = new Node(data);
        newNode->next = start;
        start = newNode;
    }
    void insertToEnd(T data) {
        Node *newNode = new Node(data);
        if(start == NULL)
        {
            start = newNode;   
        }
        else {
            Node *curr = start;
            while (curr->next != NULL)
            {
                curr = curr->next;
            }
            curr->next = newNode;
        }
    }
    void insertOrdered(T data) {
        if(start == NULL) {
            start = new Node(data);
        }
        else {
            Node  *newNode = new Node(data);
            Node *curr = start;
            Node *prev = NULL;
            while (curr != NULL && data > curr->info)
            {
                prev = curr;
                curr = curr -> next;
            }
            if(prev == NULL) {
                newNode -> next = start;
                start = newNode;
            }
            else if(curr == NULL) {
                prev->next = newNode;
            }
            else {
                prev->next = newNode;
                newNode -> next = curr ;
            }
        }
    }
    bool deleteItem(T data) {
        if(start == NULL)
            return false;
        else {
            Node *curr = start;
            Node *prev = NULL;
            while (curr != NULL && curr->info != data)
            {
                prev = curr;
                curr = curr -> next;
            }
            if(curr == NULL)
                return false;
            else if(prev == NULL) {
                start = start -> next;
                delete curr;
                return true;
            }
            else {
                prev->next = curr -> next;
                delete curr;
                return true;
            }
        }
    }
};
int main() {
    LinkedList list;
    list.insertOrdered(5);
    list.insertOrdered(15);
    list.insertOrdered(8);
    list.insertOrdered(25);
    list.insertOrdered(1);
    list.insertOrdered(13);
    list.deleteItem(1);
    list.deleteItem(8);
    list.deleteItem(25);
    list.print();
    return 0;
}