LeetCode Problem 2: Add Two Numbers

You are given two non-empty linked lists representing two non-negative integers. The digits are stored in reverse order and each of their nodes contain a single digit. Add the two numbers and return it as a linked list.You may assume the two numbers do not contain any leading zero, except the number 0 itself.
Example:
Input: (2 - 4 - 3) + (5 - 6 - 4)
Output: 7 - 0 - 8

Explanation: 342 + 465 = 807.

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