## btreetransplant
### Instructions
In order to move subtrees around within the binary search tree, write a function, `BTreeTransplant` , which replaces the subtree started by `node` with the node `rplc` in the tree given by `root` .
### Expected function
```go
func BTreeTransplant(root, node, rplc *TreeNode) *TreeNode {
}
```
### Usage
Here is a possible program 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")
node := piscine.BTreeSearchItem(root, "1")
replacement := & piscine.TreeNode{Data: "3"}
root = piscine.BTreeTransplant(root, node, replacement)
piscine.BTreeApplyInorder(root, fmt.Println)
}
```
And its output :
```console
$ go run .
3
4
5
7
$
```
