[TASK] Add ontology, fix crash not resetting speed to zero.

src/main/java/lu/jpt/csparqltest/rentacar/Car.java

@@ -179,6 +179,7 @@ public class Car {
 			this.currentState = CarState.WRECKED;
 			this.motorOn = false;
 			this.motorRpm = 0;
+			this.speed = 0;
 			break;
 		case NONE:
 			break;