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Given an integer S. Find the largest even number that can be formed by rearranging the digits of S.
Note: In case the number does not contain any even digit then output the largest odd number possible.
S = "1324"
Explanation: Largest even number: 4312
S = "3555"
Explanation: No even number possible,
So we'll find largest odd number.
You don't need to read input or print anything. Your task is to complete the function LargestEven() which takes the string S as inputs representing the integer and returns the answer.
Expected Time Complexity: O(|S| * log |S|)
Expected Auxiliary Space: O(1)
1 ≤ |S| ≤ 105
S contains only digits from '0' to '9'.
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