string to_string (char const *format, ...)
__attribute__ ((format (printf, 1, 2)));
-string &replace_all (string &str, string find, string replace);
-string &replace_all (string &str, char find, char replace);
+string &replace_all (string* str, string const &find, string const &replace);
+string &replace_all (string* str, char find, char replace);
char *string_copy (string s);
int string_compare (string const &, string const &);