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## btreemax
### Instructions
Write a function, `BTreeMax`, that returns the node with the maximum value in the tree given by `root`.
### Expected function
```go
func BTreeMax(root *TreeNode) *TreeNode {
}
```
### Usage
Here is a possible program to test your function :
```go
package main
import (
6 years ago
"fmt"
"piscine"
)
func main() {
root := &piscine.TreeNode{Data: "4"}
piscine.BTreeInsertData(root, "1")
piscine.BTreeInsertData(root, "7")
piscine.BTreeInsertData(root, "5")
max := piscine.BTreeMax(root)
fmt.Println(max.Data)
}
```
And its output :
```console
$ go run .
7
$
```