- void (*expand)(struct _cstring_t *self, char x);
- void (*expand_arr)(struct _cstring_t *self, char *x);
+ void (*expand)(struct _cstring_t *self, wchar_t x);
+ void (*expand_arr)(struct _cstring_t *self, wchar_t *x);
+ void (*strip)(struct _cstring_t *self, int pos, int len);