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## listlast
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### Instructions
Write a function `ListLast` that returns the last element of a linked list `l`.
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### Expected function and structure
```go
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type NodeL struct {
Data interface{}
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Next *NodeL
}
type List struct {
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Head *NodeL
Tail *NodeL
}
func ListLast(l *List) interface{} {
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}
```
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### Usage
Here is a possible program to test your function :
```go
package main
import (
"fmt"
"piscine"
)
func main() {
link := &piscine.List{}
link2 := &piscine.List{}
piscine.ListPushBack(link, "three")
piscine.ListPushBack(link, 3)
piscine.ListPushBack(link, "1")
fmt.Println(piscine.ListLast(link))
fmt.Println(piscine.ListLast(link2))
}
```
And its output :
```console
$ go run .
1
<nil>
$
```