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## btreeisbinary
### Instructions
Write a function, `BTreeIsBinary`, that returns `true` only if the tree given by `root` follows the binary search tree properties.
### Expected function
```go
func BTreeIsBinary(root *TreeNode) bool {
}
```
### 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")
fmt.Println(piscine.BTreeIsBinary(root))
}
```
And its output :
```console
student@ubuntu:~/[[ROOT]]/test$ go build
student@ubuntu:~/[[ROOT]]/test$ ./test
true
student@ubuntu:~/[[ROOT]]/test$
```