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## unmatch
### Instructions
Write a function, `Unmatch`, that returns the element of the slice (arr) that does not have a correspondent pair.
5 years ago
- If all the number have a correspondent pair, it shoud return `-1`.
### 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"
piscine ".."
)
func main() {
arr := []int{1, 2, 3, 1, 2, 3, 4}
unmatch := piscine.Unmatch(arr)
fmt.Println(unmatch)
}
```
And its output :
```console
student@ubuntu:~/piscine/test$ go build
student@ubuntu:~/piscine/test$ ./test
4
student@ubuntu:~/piscine/test$
```