add two nums

package main

import "fmt"

type ListNode struct {
     Val int
     Next *ListNode
 }

func main() {
    var l1 *ListNode
    var l2 *ListNode


    l1 = &ListNode{
        Val:5,
        Next:&ListNode{
            Val:8,
            Next:&ListNode{
                Val:3,
            },
        },
    }

    l2 = &ListNode{
        Val:5,
        Next:&ListNode{
            Val:6,
            Next:&ListNode{
                Val:4,
            },
        },
    }
    res := addTwoNumbers(l1,l2)
    fmt.Println(res)

}
/**
 * Definition for singly-linked list.
 * type ListNode struct {
 *     Val int
 *     Next *ListNode
 * }
 */
func addTwoNumbers(l1 *ListNode, l2 *ListNode) *ListNode{

    var l1List []int
    var l2List []int
    for tmp1 := l1;tmp1 != nil ;tmp1 = tmp1.Next {
        l1List = append(l1List,tmp1.Val)
    }
    for tmp2 := l2;tmp2 != nil ;tmp2 = tmp2.Next {
        l2List = append(l2List,tmp2.Val)
    }
    rem := 0
    var res *ListNode
    var resTmp *ListNode

    maxLen := 0
    if len(l1List) > len(l2List){
        maxLen = len(l1List)+1
    }else {
        maxLen = len(l2List)+1
    }

    for i := 0;i<maxLen;i++{

        l1Value := 0
        if i>=len(l1List){
            l1Value = 0
        }else{
            l1Value = l1List[i]
        }

        l2Value := 0
        if i>=len(l2List){
            l2Value = 0
        }else{
            l2Value = l2List[i]
        }
        count := l1Value + l2Value + rem

        sum := 0
        if count>=10{
            rem = 1
            sum = count-10
        }else{
            rem = 0
            sum = count
        }

        if sum !=0 || i != maxLen-1{


            if res == nil{
                res = &ListNode{
                    Val:sum,
                }
                resTmp = res
            }else{
                resTmp.Next = &ListNode{
                    Val:sum,
                }
                resTmp = resTmp.Next
            }

        }

    }

    return res

}