Voters will have a chance to retool city government in April when they consider a new charter that would put a professional manager in charge of the city's day-to-day decisions. The City Council approved putting the measure on the ballot by a unanimous vote at a special meeting Monday night, after four hours of fine-tuning. Some critics believe that the current system, which puts each council member at the head of a city department, encourages meddling and conflict. The proposed charter transfers the management power from the council to the manager _ including the right to hire and fire city employees. It is not the first time the city has considered professional managers, but it would be the first time the managers' powers would be enshrined in the charter. Voters can decide for themselves when the proposed charter appears on ballots April 12.