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## listpushback
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### Instructions
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Write a function `ListPushBack` that inserts a new element `NodeL` at the end of the list `l` while using the structure `List`.
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### Expected function and structure
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```go
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type NodeL struct {
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Data interface{}
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Next *NodeL
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}
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type List struct {
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Head *NodeL
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Tail *NodeL
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}
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func ListPushBack(l *List, data interface{}) {
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}
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```
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### Usage
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Here is a possible program to test your function :
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```go
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package main
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import (
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"fmt"
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"piscine"
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)
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func main() {
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link := &piscine.List{}
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piscine.ListPushBack(link, "Hello")
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piscine.ListPushBack(link, "man")
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piscine.ListPushBack(link, "how are you")
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for link.Head != nil {
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fmt.Println(link.Head.Data)
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link.Head = link.Head.Next
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}
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}
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```
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And its output :
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```console
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$ go run .
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Hello
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man
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how are you
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$
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```
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