The legislature shall pass no special act conferring corporate powers, but it shall pass general laws under which corporations may be organized and corporate powers obtained, subject, nevertheless, to repeal at the will of the legislature; and shall pass general laws under which charters may be altered or amended. The legislature shall, by general law, provide for the payment to the State of Alabama of a franchise tax by corporations organized under the laws of this state, which shall be in proportion to the amount of capital stock; but strictly benevolent, educational, or religious corporations shall not be required to pay such a tax. The charter of any corporation shall be subject to amendment, alteration, or repeal under general laws.