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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`.
### Expected function
```go
func BTreeApplyByLevel(root *TreeNode, f func(...interface{}) (int, error)) {
}
```
### 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")
piscine.BTreeApplyByLevel(root, fmt.Println)
}
```
And its output :
```console
$ go run .
4
1
7
5
$
```