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DIY: Add Two Numbers II

Understand how to add two numbers stored in linked lists where each node represents a digit, with the most significant digit first. Learn to implement a function that returns their sum as a new linked list. This exercise helps prepare for coding interview questions involving linked lists and number manipulation.

Problem statement

Given two non-empty linked lists representing two non-negative integers, you have to add the two numbers and return the sum as a linked list. The digits are stored in such a way that the most significant digit comes first, and each of their nodes contains a single digit.

You may ...