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## btreelevelcount
### Instructions
Write a function, `BTreeLevelCount`, that returns the number of levels of the binary tree (height of the tree)
### Expected function
```go
func BTreeLevelCount(root *TreeNode) int {
}
```
### 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")
fmt.Println(piscine.BTreeLevelCount(root))
}
```
And its output :
```console
$ go run .
3
$
```