Except where some other method is prescribed by law, all licenses required for engaging in a business shall be issued by the city manager in the exercise of the city manager's discretion; provided, however, that such manager may refuse a license in any case where the applicant is not of good moral character, free from disease, or trustworthy in such applicant's business dealings or for any other reason that satisfies the manager that the interests of the public would be best protected by withholding a license from the applicant. (2007 Code § 31-4)