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## join
### Instructions
Write a function, Join, that returns the elements of a slice strings (arstr) join together in one string. Using the string 'sep' as a separator between each element of the array
The function must have the next signature.
### Expected function
```go
func Join(arstr []string, sep string) string {
}
```
### Usage
Here is a possible [program ](TODO-LINK ) to test your function :
```go
package main
import (
"fmt"
student ".."
)
func main() {
arrStr := []string{"hello", "how", "are", "you"}
joined := student.Join(arrStr, "--")
fmt.Println(joined)
}
```
And its output :
```console
student@ubuntu:~/student/join$ go build
student@ubuntu:~/student/join$ ./join
hello--how--are--you
student@ubuntu:~/student/join$
```
