My second commit. Some changes made. Firstly, the orientation variable in the bot class was redefined to an enum that could take in values one of north, west, east or south. The attributes of the cell class have been redefined. In the grid class, the no_of_robots parameter was removed. I'm still thinking on whether to have that attribute in this class or not. For now, I've removed it though. And a few more minor changes here and there.