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Remove Duplicates
Easy Accuracy: 60.92% Submissions: 2785 Points: 2

Given a string without spaces, the task is to remove duplicates from it.

Note: The original order of characters must be kept the same. 

Example 1:

Input: S = "geeksforGeeks"
Output: geksfor
Explanation: Only keep the first
occurrence

Example 2:

Input: S = "gfg"
Output: gf
Explanation: Only keep the first
occurrence

Your task:
Your task is to complete the function removeDups() which takes a single string as input and returns the string. You need not take any input or print anything.
 

Expected Time Complexity: O(|s|)
Expected Auxiliary Space: O(constant)

Constraints:
1 <= |S| <= 105
S conatins lowercase english alphabets

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Remove Duplicates

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