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## listpushback
### Instructions
Write a function `ListSize` that returns the number of elements in the list.
### Expected function and structure
```go
type Node struct {
Data interface{}
Next *Node
}
type List struct {
Head *Node
Tail *Node
}
func ListSize(l *List) int {
}
```
### Usage
Here is a possible [program](TODO-LINK) to test your function :
```go
package main
import (
"fmt"
piscine ".."
)
func main() {
link := &List{}
piscine.ListPushFront(link, "Hello")
piscine.ListPushFront(link, "2")
piscine.ListPushFront(link, "you")
piscine.ListPushFront(link, "man")
fmt.Println(piscine.ListSize(link))
}
```
And its output :
```console
student@ubuntu:~/piscine/test$ go build
student@ubuntu:~/piscine/test$ ./test
4
student@ubuntu:~/piscine/test$
```