challenge #10 stay away from the edge

In this challenge we had to design a robot to not fall off the edge of the table by waiting until it sensed the edge, backing up, turning around and driving off. We did this by waiting until the colour sensor detected a change in colour which the colour sensor senses when it goes off the edge. This is a picture of the code.

Nothing really went wrong in the code because I had already made it for an earlier challenge by accident so I knew what the code had to be. We used the driving base so the building was fine. I didn't really learn much. My goals for the next challenge are if I already know how to solve the challenge to intergate something that I don't know into the challenge. Here is a video of the robot