Turtles in the stars

This is the last hand-on turtles exercise before recursion. The goal is to draw three 5-branches stars. Like any regular stars with N branches, the angle at each external corners are 360/N degrees while the angles between branches are of 2*360/N degrees.

The first star to draw is black (Color.black) and its branches are 100 steps long. The second is blue (Color.blue) and its branches are 80 steps long. It's shifted of 45 degrees from the first one. The last star is red (Color.red), its branches are 60 steps long and it's shifted of 45 degrees from the previous one.

Observe the world's objective to visualize the picture to draw.