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## btreemin
### Instructions
Write a function, `BTreeMin`, that returns the node with the minimum value in the tree given by root
### Expected function
```go
func BTreeMin(root *TreeNode) *TreeNode {
}
```
### Usage
Here is a possible [program](TODO-LINK) to test your function :
```go
package main
import (
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"fmt"
piscine ".."
)
func main() {
root := &piscine.TreeNode{Data: "4"}
piscine.BTreeInsertData(root, "1")
piscine.BTreeInsertData(root, "7")
piscine.BTreeInsertData(root, "5")
min := piscine.BTreeMin(root)
fmt.Println(min.Data)
}
```
And its output :
```console
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student@ubuntu:~/piscine-go/test$ go build
student@ubuntu:~/piscine-go/test$ ./test
1
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student@ubuntu:~/piscine-go/test$
```