traficlight

main.dart

class TrafficLight {
  static String updateLight(String currentState) {
    return "Solution";
  }
}

void main() {
  assert(TrafficLight.updateLight("green") == "yellow",
      "Not correct answer for green");
  print("Color is yellow");
  assert(TrafficLight.updateLight("yellow") == "red",
      "Not correct answer for yellow");
  print("Color is red");
  assert(
      TrafficLight.updateLight("red") == "green", "Not correct answer for red");
  print("Color is green");
}