Increment duplicate elements

how to create a method to increment all duplicate element expect the first in a sorted array until obtain an array without any duplication items for example array={1,2,3,3,4,4} the solution: like this array={1,2,3,4,4,4} array={1,2,3,4,5,4} array={1,2,3,4,5,5} array={1,2,3,4,5,6}