-char is_passable (struct Map *, uint16_t, uint16_t);
-struct yx_uint16 mv_yx_in_dir (char, struct yx_uint16);
-void move_monster (struct World *, struct Monster *);
-void move_player (struct World *, char);
-void player_wait(struct World *);
+extern void turn_over (struct World *, char);
+extern void save_game(struct World *);