style: format code with Ktlint

This commit fixes the style issues introduced in bedefab according to the output
from Ktlint.

Details: None

src/main/kotlin/org/example/RoverState.kt

@@ -4,4 +4,4 @@ class RoverState {
     var positionX: Int = 0
     var positionY: Int = 0
     var heading: Char = HEADING_NORTH
-}
+}