code: static double routeDistanceRemaining(double legDistanceRemaining, int legIndex,
                                         DirectionsRoute directionsRoute) {
      if (directionsRoute.legs().size() < 2) {
        return legDistanceRemaining;
      }
  
      for (int i = legIndex + 1; i < directionsRoute.legs().size(); i++) {
        legDistanceRemaining += directionsRoute.legs().get(i).distance();
      }
      return legDistanceRemaining;
    }
docs: Takes in the leg distance remaining value already calculated and if additional legs need to be
  traversed along after the current one, adds those distances and returns the new distance.
  Otherwise, if the route only contains one leg or the users on the last leg, this value will
  equal the leg distance remaining.