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 contains a single digit. Add the two numbers and return the sum as a linked list.

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Adding two numbers represented as linked lists with different lengths.

Traverse both linked lists simultaneously, adding corresponding digits and carrying over the carry.
If one list is shorter, consider the remaining digits as 0.
Create a new linked list to store the result.
Handle the case when the sum of digits exceeds 9 by carrying over the digit to the next place value.
If there is a carry after adding all digits, add an additional node to the result linked list.

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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 contains a single digit. Add the two numbers and return the sum as a linked list.

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