extern void speak(const char*, ...);
extern void pspeak(vocab_t, enum speaktype, int, ...);
extern void rspeak(vocab_t, ...);
-extern void echo_input(FILE*, char*, char*);
+extern void echo_input(FILE*, const char*, const char*);
extern int word_count(char*);
extern char* get_input(void);
extern bool silent_yes(void);