char *str_tolower (char*);
char *str_substrcpy (char*, const char*, const char*, size_t);
char *str_substrdup (const char*, const char*);
char *str_tolower (char*);
char *str_substrcpy (char*, const char*, const char*, size_t);
char *str_substrdup (const char*, const char*);
void str_adjust (char**);
int str_eq (const char*, const char*);
const char *str_isstr (const char*, const char*);
void str_adjust (char**);
int str_eq (const char*, const char*);
const char *str_isstr (const char*, const char*);