extern jb_err string_append(char **target_string, const char *text_to_append);
extern jb_err string_join (char **target_string, char *text_to_append);
extern char *string_toupper(const char *string);
extern jb_err string_append(char **target_string, const char *text_to_append);
extern jb_err string_join (char **target_string, char *text_to_append);
extern char *string_toupper(const char *string);