Rumis is a multiplayer 3D block board game where the goal is to have the most squares visible, when viewed from above, after pieces have been played till there are no moves remaining. The picture below shows a completed 4-player round. There are a variety of board stencils and permissible heights possible in this game.
For this problem, you will be provided a completed 2-player rectangular board where the two players' colors are red and blue. The board will be two levels high and completely filled. It will also be a character array wherein the two players' squares are represented by 'r' or 'b'. See the test suite for examples.
Write a function to count the squares visible when viewed from above to determine who won each round.