Implemented DNF with random chance in Race

#story [17]

src/main/java/seng302/Model/Race.java

@@ -11,6 +11,7 @@ import seng302.Controllers.RaceController;
 import seng302.GPSCoordinate;
 
 import java.util.ArrayList;
+import java.util.Random;
 
 /**
  * Parent class for races
@@ -171,6 +172,11 @@ public abstract class Race implements Runnable {
         Platform.runLater(() -> {controller.setFrames("FPS: " + fps);});
     }
 
+    private boolean doNotFinish() {
+        Random rand = new Random();
+        return rand.nextInt(100) < 1;
+    }
+
     /**
      * Starts the Race Simulation, playing the race start to finish with the timescale.
      * This prints the boats participating, the order that the events occur in time order, and the respective information of the events.
@@ -240,6 +246,10 @@ public abstract class Race implements Runnable {
                 boatsFinished++;
                 boat.setFinished(true);
                 boat.setTimeFinished(timeElapsed);
+            } else if(doNotFinish()) {
+                boatsFinished++;
+                boat.setFinished(true);
+                boat.setCurrentLeg(new Leg("DNF",-1));
             } else {
                 boat.setDistanceTravelledInLeg(boat.getDistanceTravelledInLeg() - boat.getCurrentLeg().getDistance());
                 Leg nextLeg = legs.get(boat.getCurrentLeg().getLegNumber() + 1);