extern void textfile_sizes (FILE *, uint16_t *, uint16_t *);
extern uint16_t rrand(char, uint32_t);
extern void update_log (struct World *, char *);
extern void textfile_sizes (FILE *, uint16_t *, uint16_t *);
extern uint16_t rrand(char, uint32_t);
extern void update_log (struct World *, char *);