VALUE bug_str_modify(VALUE str)
static long NUM2LONG(VALUE x)
VALUE bug_str_modify_expand(VALUE str, VALUE expand)
void Init_modify(VALUE klass)
void rb_str_modify_expand(VALUE, long)
void rb_str_modify(VALUE)
void rb_define_method(VALUE klass, const char *name, VALUE(*func)(ANYARGS), int argc)