Q*Bert Cuss String Replacement

// Char array
void qbertcuss(char *s, int len)
{
    for ( in q = 0; q < len; ++q )
    {
        if ( !s[q] ) return; // exit on null char if it is sooner than 'len'
        switch( s[q] )
        {
            case 'a':
            case 'e':
            case 'i':
            case 'o':
            case 'u':
            case 'A':
            case 'E':
            case 'I':
            case 'O':
            case 'U':
                s[q] = '*'; break;
            default: break;
        }
    }
}

// std::string
void qbertcuss(std::string *s)
{
    for ( int q = 0; q <= s->size(); ++q )
    {
        switch( s[q] )
        {
            case 'a':
            case 'e':
            case 'i':
            case 'o':
            case 'u':
            case 'A':
            case 'E':
            case 'I':
            case 'O':
            case 'U':
                s[q] = '*'; break;
            default: break;
        }
    }
}