Trace a path across a room.
★☆☆Robot vacuum cleaners move across a room automatically collecting dust and small debris. At a very basic level their navigation traces a straight line path, turning when they detect the end of the room.
Write a program to trace across a virtual room on the turtle canvas. First by moving out of a docking station by 20 pixels, turning right and moving 4 meters (100 pixels). Once the end of the room is reached the robot moves up 20 pixels before turning left and moving across the room 4 meters. It needs to do this 5 times to cover the whole room. It does not need to return to the docking station (although this is a nice extension).
Remember to add a comment before a subprogram to explain its purpose.
vacuum that: