Addnumbers_Linkedkist

#Add two numbers 


class Solution:
    def addTwoNumbers(self, l1: Optional[ListNode], l2: Optional[ListNode]) -> Optional[ListNode]:
        dummy = ListNode()
        tail, carry  = dummy, 0

        while l1 or l2 or carry != 0:
            num1 = l1.val if l1 else 0
            num2 = l2.val if l2 else 0

            nodeVal = num1 + num2 + carry
            carry = nodeVal // 10
            nodeVal = nodeVal % 10
            tail.next = ListNode(nodeVal)

            l1 = l1.next if l1 else None
            l2 = l2.next if l2 else None
            tail = tail.next

        return dummy.next