pub unsafe extern "C" fn opendal_writer_free(ptr: *mut opendal_writer) {
        if !ptr.is_null() {
            let _ = (*ptr).deref_mut().close();   // NOTE HERE: the error is ignored
            drop(Box::from_raw((*ptr).inner as *mut core::BlockingWriter));
            drop(Box::from_raw(ptr));
        }
    }