message: Remove unused yield random number generator
diff: @@ -58,11 +58,9 @@ std::random_device rd;
  std::mt19937 generator(rd());
  std::uniform_int_distribution<int> map_width(5, MAP_WIDTH - 5);
  std::uniform_int_distribution<int> map_height(5, MAP_HEIGHT - 5);
  -std::uniform_int_distribution<int> mine_yield(0, 100);
  auto mwidth = std::bind(map_width, std::ref(generator));
  auto mheight = std::bind(map_height, std::ref(generator));
  -auto myield = std::bind(mine_yield, std::ref(generator));
  // ===============================================================================
  