TempBubbleDouble, C++ (gcc)

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//g++  7.4.0
//Templated Bubble Sort in Double Linked List
//code credit internet
// template modifications by Rezaul Hoque on March 10,2021
#include <iostream>
#include <bits/stdc++.h>
using namespace std;
template <class T>
class node
{
 public:
    T val;
     node<T> *next;
     node<T> *prev;
};
template <class T>
void swap(node<T> * left, node<T>* right)
{
   T temp = left->val;
left->val = right->val;
right->val= temp;
}
template <class T>
void bubble(node<T>* left)//credit prodevelopertutorial
{
 
int swapon;

node<T> *leftpt;
    node<T> *rightpt = NULL; 
    do
    {   
        swapon = 0;
        leftpt = left;
        while(leftpt->next != rightpt)
        {
            if (leftpt->val > leftpt->next->val) 
            {
             swap(leftpt, leftpt->next); 
                swapon = 1; 
            }
            leftpt = leftpt->next;
        }
        
        rightpt = leftpt;

}while(swapon);
}

int main()
{
     node<int > *head = (node<int>*)  malloc(sizeof( node<int>));
    head->val = 2;
    head->prev = NULL;
     node<int > *l1 = (node<int>*)  malloc(sizeof( node<int>));
    l1->val = 8;
    l1->prev = head;
    head->next = l1;
     node<int> *l2 = (node<int>*)  malloc(sizeof( node<int>));
    l2->val = 3;
    l2->prev = l1;
    l1->next = l2;
     node<int>*l3 = (node<int>*)  malloc(sizeof( node<int>));
    l3->val = 5;
    l3->prev = l2;
    l2->next = l3;
     node<int> *l4 = (node<int>*)  malloc(sizeof( node<int>));
    l4->val = 10;
    l4->prev = l3;
    l3->next = l4;
    l4->next = NULL;
    node<char>* chead  = (node<char>*)malloc(sizeof(node<char>));
chead->val='G';chead->prev = NULL;
node<char>*  cl1 = (node<char>*)malloc(sizeof(node<char>));
cl1->val = 'E'; cl1->prev = chead; chead->next = cl1;
node<char>* cl2= (node<char>*)malloc(sizeof(node<char>));
cl2->val = 'H'; cl2->prev = cl1; cl1->next= cl2;
node<char>* cl3  = (node<char>*)malloc(sizeof(node<char>));
cl3->val = 'F'; cl3->prev = cl2; cl2->next= cl3;
node<char>* cl4 = (node<char>*)malloc(sizeof(node<char>));
cl4->val= 'A'; cl4->prev = cl3; cl3->next= cl4; cl4->next = NULL;

cout<<"After bubble sort:\n";
    bubble(head);
    while (head != NULL)
    {
         cout<<" "<<head->val;
        head = head->next;
    }
cout <<endl;
bubble(chead);
    while (chead != NULL)
    {
         cout<<" "<<chead->val;
        chead = chead->next;
    }

return 0;

}

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Compilation time: 1.42 sec, absolute running time: 0.15 sec, cpu time: 0.01 sec, memory peak: 5 Mb, absolute service time: 1,59 sec