IBAN\Generation\IBANGenerator::prepareAndCheckInstituteIdentification PHP Method

    protected function prepareAndCheckInstituteIdentification($instituteIdentification)
    {
        $instituteIdentification = $this->normalize($instituteIdentification);
        if (empty($instituteIdentification)) {
            throw new \InvalidArgumentException('instituteIdentification is missing');
        }
        return $instituteIdentification;
    }