Given a string S, remove all consonants and print the modified string that contains vowels only.
Example 1:
Input
S = "abEkipo"
Output
aEio
Explanation : a, E, i, o are only vowels in the string.
Example 2:
Input
S = "rrty"
Output
No Vowel
Explanation: There are no vowels.
Your Task: You don't need to read input or print anything.Your task is to complete the function removeConsonants() which takes a string as input parameters, and returns the modified string that contains vowels only. If there is no vowel present in the string S, then return "No Vowel".
Expected Time Complexity: O(|S|).
Expected Auxiliary Space: O(1).
Constraints
1 <= |S| <= 10^{5}
The string should consist of only alphabets.

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