Count Vowels in a String
EasyArrayStringIteration.Character Analysis
### Description
Write a function that takes a string input and returns the number of vowels (a, e, i, o, u) present in it. The check should be case-insensitive.
### Constraints
- The string will contain only alphabetical characters and spaces.
- Length of the string ≤ 10^5
### Example
Input: Prepverse is awesome
Output: 8
Examples
Example 1
Input: Hello
Output: 2
Example 2
Input: Prepverse is awesome
Output: 8