Task: do not allow Your robot to cross a boundary.

Using a black stripe, make a square, or some other type of boundary, and program the robot so that it always moves inside the set limits (stripe).

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void RobotLine::loop() {
	if (setup())
		go(60, 60);

	if (line(4)){
		go(100, -100);
		delayMs(500);
		go(60, 60);
	}
}