An attorney who serves as a public prosecutor shall:
(1) except for a prosecution undertaken by a city attorney under Section 10-3-928, conduct, on behalf of the state, all prosecutions for a public offense committed within a county or prosecution district;
(2) conduct, on behalf of the county, all prosecutions for a public offense in violation of a county criminal ordinance; and
(3) perform all other duties and responsibilities as required by law.