-void record_action (char);
-struct yx_uint16 mv_yx_in_dir (char, struct yx_uint16);
-char yx_uint16_cmp (struct yx_uint16, struct yx_uint16);
-void next_turn (struct World *);
-void update_log (struct World *, char *);
-void move_player (struct World *, char);