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## join
### Instructions
Write a function, Unmatch, that returns the element of the slice (arr) that does not have a correspondent pair.
The function must have the next signature.
### Expected function
```go
func Unmatch(arr []int) int {
}
```
### Usage
Here is a possible [program](TODO-LINK) to test your function :
```go
package main
import (
"fmt"
student ".."
)
func main() {
arr := []int{1, 2, 3, 1, 2, 3, 4}
unmatch := student.Unmatch(arr)
fmt.Println(unmatch)
}
```
And its output :
```console
student@ubuntu:~/student/unmatch$ go build
student@ubuntu:~/student/unmatch$ ./unmatch
4
student@ubuntu:~/student/unmatch$
```