Sum Of Two Linked List

Question Name - Sum List
Topic - Linked List

Can anyone please help me with this ques( Given two numbers represented by two linked lists, write a function that returns sum list.
The sum list is linked list representation of addition of two input numbers. It is not allowed to modify the lists.
Also, not allowed to use explicit extra space (Hint: Use Recursion ) .

My Code - https://ide.codingblocks.com/s/77869