H-bot is simple way to control X-Y CNC table with just two stepper motors and string. More on the subject you can find on the net.
Make code which moves the CNC table at position X,Y by rotating the two stepper motors. You know the string length, motor shaft diameter, etc parameters. Starting from center 0,0 you calculate the rotation angle of both motors when new X,Y coordinate is entered. 0,0 is in the center so XY can be positive and negative.
You can code the solution in any programming language during the weekend and have to submit it to firstname.lastname@example.org latest on Sunday May 11th.
On Monday we will upload the solutions on GitHub https://github.com/OLIMEX/WPC
You can play with your real name or with nick if you want to be anonymous, we will not disclosure your personal info if you do not want to.