Given a string, remove spaces from it.
Example 1:
Input:
S = "geeks for geeks"
Output: geeksforgeeks
Explanation: All the spaces have been
removed.
Example 2:
Input:
S = " g f g"
Output: gfg
Explanation: All the spaces including
the leading ones have been removed.
Your Task:
You don't need to read input or print anything. Your task is to complete the function modify() which takes the string S as input and returns the resultant string by removing all the white spaces from S.
Expected Time Complexity: O(|S|).
Expected Auxiliary Space: O(1).
Constraints:
1<=|S|<=10^{5}

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