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## btreemax
### Instructions
Write a function, `BTreeMax`, that returns the node with the maximum value in the tree given by root
This function must have the following signature.
### Expected function
```go
func BTreeMax(root *TreeNode) *TreeNode {
}
```
### Usage
Here is a possible [program](TODO-LINK) to test your function :
```go
package main
import (
"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
student@ubuntu:~/student/test$ go build
student@ubuntu:~/student/test$ ./test
7
student@ubuntu:~/student/test$
```