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## listsort
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### Instructions
Write a function `ListSort` that sorts the nodes of a linked list by ascending order.
- The `NodeI` structure will be the only one used.
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### Expected function and structure
```go
type NodeI struct {
Data int
Next *NodeI
}
func ListSort(l *NodeI) *NodeI {
}
```
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### Usage
Here is a possible program to test your function :
```go
package main
import (
"fmt"
"piscine"
)
func PrintList(l *piscine.NodeI) {
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it := l
for it != nil {
fmt.Print(it.Data, " -> ")
it = it.Next
}
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fmt.Print(nil, "\n")
}
func listPushBack(l *piscine.NodeI, data int) *piscine.NodeI {
n := &piscine.NodeI{Data: data}
if l == nil {
return n
}
iterator := l
for iterator.Next != nil {
iterator = iterator.Next
}
iterator.Next = n
return l
}
func main() {
var link *piscine.NodeI
link = listPushBack(link, 5)
link = listPushBack(link, 4)
link = listPushBack(link, 3)
link = listPushBack(link, 2)
link = listPushBack(link, 1)
PrintList(piscine.ListSort(link))
}
```
And its output :
```console
$ go run .
1 -> 2 -> 3 -> 4 -> 5 -> <nil>
$
```