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## btreeinsertdata
### Instructions
Write a function that applies a function using a postorder walk to each element in the tree
### Expected function
```go
func BTreeApplyPostorder(root *piscine.TreeNode, f func(...interface{}) (int, error)) {
}
```
### 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")
BTreeApplyPostorder(root, fmt.Println)
}
```
And its output :
```console
student@ubuntu:~/piscine/btreeinsertdata$ go build
student@ubuntu:~/piscine/btreeinsertdata$ ./btreeinsertdata
1
5
7
4
student@ubuntu:~/piscine/btreeinsertdata$
```