@Override
    public Promise<Void> unlink(String link) {
        return adapter.toPromise(handler -> vertx.fileSystem().unlink(link, handler));
    }
@ Override public Promise < Void > unlink ( String link ) { return adapter . toPromise ( handler -> vertx . fileSystem ( ) . unlink ( link , handler ) ) ; }
Unlinks the link on the file system represented by the path {@code link}, asynchronously.

@param link the link
@return a promise for completion