#include <stdio.h>
#include <ctype.h>

void novowels(char *string);

void main()
{
    char *phrase = "No more vowels in Fredonia!";

    puts("Before purification:\n");
    puts(phrase);

    novowels(phrase);

    puts("\nAfter purification:\n");
    puts(phrase);
}

void novowels(char *string)
{
    while(*string++)
    {
        switch(toupper(*string))
        {
            case('A'):
                *string = '&';
                break;
            case('E'):
                *string = '@';
                break;
            case('I'):
                *string = '#';
                break;
            case('O'):
                *string = '$';
                break;
            case('U'):
                *string = '%';
                break;
            default:
                break;
        }
    }
}