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## btreelevelcount
### Instructions
Write a function, `BTreeLevelCount`, that return the number of levels of the tree (height of the tree)
### Expected function
```go
func BTreeLevelCount(root *TreeNode) int {
}
```
### Usage
Here is a possible [program](TODO-LINK) 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")
fmt.Println(piscine.BTreeLevelCount(root))
}
```
And its output :
```console
student@ubuntu:~/student/test$ go build
student@ubuntu:~/student/test$ ./test
3
student@ubuntu:~/student/test$
```