Be it further enacted, that the city manager, by and with the consent of the City Council, may exchange any bonds belonging to a sinking fund or bonds of the city whenever such exchange may be deemed advantageous for the city. (As amended by Priv. Acts 1972, ch. 416, sec. 13, Priv. Acts 1995, ch. 55, sec. 2, and Priv. Acts 2014, ch. 55, sec. 1)