Solution: Add Two Numbers

Statement

You are given two non-empty linked lists, where each list represents a non-negative integer.
The digits are stored in reverse order, and each node contains exactly one digit.

Your task is to add the two integers and return the result as a linked list, also stored in reverse order.

Constraints:

• The number of nodes in each linked list is in the range $[1, 100]$.

• $0 \leq$ Node.val $\leq 9$ ...