(a) Any person who has been convicted in the municipal court and sentenced by the municipal judge for violation of any ordinance of the city, whether the punishment be by fine or imprisonment or by both, may be put to work to perform labor on the public streets, highways, alleys, or other public works or buildings of the city. It shall be deemed a part of the judgment and sentence of the court that such prisoner may be worked as herein provided. The chief of police shall have power and be authorized to have or cause all such prisoners to work out the full number of days for which they have been sentenced.

    (b) If the punishment is by fine and the fine be not paid, then for every ten dollars ($10.00) of such judgment the prisoner shall work one day.

(Code 1964, § 7.175)