RemoveDuplicatesFromSortedArray is not working as expected and output shows extra element in an array

[ghost]

LeetCode-Swift/Array/RemoveDuplicatesFromSortedArray.swift The solution to the above problem doesn't seems to be correct.

e.g Input: [1,1,2,2,5,5,6,8,9,9,9] Program output in Leetcode console: [1,2,5,6,8,9] Program Output in Xcode Playground : [1, 2, 5, 6, 8, 9, 6, 8, 9, 9, 9] Expected Output is: [1,2,5,6,8,9]