Adding comments with SniperJavaPrettyPrinter (no break line)

When I add a comment to an existing statement and pretty-print it does not add line breaks.
e.g:

SPOON TEST SOURCE:
```java
Launcher launcher = new Launcher();

launcher.getEnvironment().setPrettyPrinterCreator(() -> new SniperJavaPrettyPrinter(launcher.getEnvironment()));

launcher.addInputResource("src/test/java/spoon/MyDummyClass.java");

launcher.buildModel();

Factory factory = launcher.getFactory();

factory.Package().getRootPackage().getElements(new AbstractFilter>() {
@Override
public boolean matches(CtInvocation element) {
return element.getExecutable().getSimpleName().equals("println")
&& element.getTarget().toString().equals("java.lang.System.out");
}
}).forEach(i -> i.addComment(factory.createComment("MY COMMENT", CommentType.INLINE)));

launcher.prettyprint();
```

TARGET CLASS:
```java
public class MyDummyClass {
public static void main(String[] args) {
System.out.println("hello");
}
}
```

RESULT:
```java
public class MyDummyClass {
public static void main(String[] args) {
// MY COMMENTSystem.out.println("hello");
}
}
```
Using other "CommentType" results in similar issues.