How to replace all vowels with spaces?

Question

C++ / C#

There is a character string and you need to replace each vowel with a space, I can’t understand what condition for the loop is needed.

Answer 1

It seems that in C there are no special conditions for this.
Or a multiple case or make an array of vowels and drive away with another inner loop.

Answer 2

You need to make an array of boolean variables, and assign an index (character code) to each vowel, and set the values ​​​​to true for these indices. This array is created once and used repeatedly.
Further, in the character string in a loop, check each character. We take its code, turn it into an index - and look in the array, if true, then replace it with a space.