remove_duplicates_from_string.py

class Solution:
    def removeDuplicates(self, nums:int) -> int:
        if not nums:
            return 0
        k = 1

        i = 1

        while i < len(nums):
            if nums[i] != nums[k - 1]:
                nums[k] = nums[i]
                k += 1
            i += 1
        return k