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## btreeapplybylevel
### Instructions
Write a function, `BTreeApplyByLevel`, that applies the function given by fn to each node of the tree given by root.
This function must have the following signature.
### Expected function
```go
func BTreeApplyByLevel(root *TreeNode, fn interface{}) {
}
```
### 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")
piscine.BTreeApplyByLevel(root, fmt.Println)
}
```
And its output :
```console
student@ubuntu:~/student/test$ go build
student@ubuntu:~/student/test$ ./test
4
1
7
5
student@ubuntu:~/student/test$
```