-game_state *make_move(game_state *from, game_ui *ui, int x, int y, int button)
+static game_ui *new_ui(game_state *state)
+{
+ return NULL;
+}
+
+static void free_ui(game_ui *ui)
+{
+}
+
+static game_state *make_move(game_state *from, game_ui *ui,
+ int x, int y, int button)