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## btreeinsertdata
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### Instructions
Write a function that inserts new data in a `binary search tree` following the special properties of a `binary search trees`.
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The nodes must be defined as follows :
### Notions
- [binary search trees](https://en.wikipedia.org/wiki/Binary_search_tree)
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### Expected function
```go
type TreeNode struct {
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Left, Right, Parent *TreeNode
Data string
}
func BTreeInsertData(root *TreeNode, data string) *TreeNode {
}
```
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### 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")
fmt.Println(root.Left.Data)
fmt.Println(root.Data)
fmt.Println(root.Right.Left.Data)
fmt.Println(root.Right.Data)
}
```
And its output :
```console
$ go run .
1
4
5
7
$
```