In the fourth lesson, we started to show the power of "generalizing" our code. Let's do some more generalization. Instead of making the sides of the curve stitch equal to the size of the canvas, lets introduce a dedicated variable "cureStitchLength" to control the size of the stitch. Let's also introduce two more variables "x" and "y" to control the position of the stitch's corner. Let's gives these new variables the demo value of 100, and reduce the number of lines in the stitch from 100 to 20.