## GoodbyeMars

### Instructions

In a file named `GoodbyeMars.java` write a function `goodbyeMars` that returns the string 'Goodbye Mars !'.

### Expected Functions

```java
public class GoodbyeMars {
    public static String goodbyeMars() {
        // your code here
    }
}
```

### Usage

Here is a possible `ExerciseRunner.java` to test your function :

```java
public class ExerciseRunner {
    public static void main(String[] args) {
        System.out.println(GoodbyeMars.goodbyeMars());
    }
}
```

and its output :

```shell
$ javac *.java -d build
$ java -cp build ExerciseRunner
Goodbye Mars !
$
```