[Gammix]

Here is better version i made:

pawn Код:

IsSafeGameText(string[])
{
    new count;
    for(new num, len = strlen(string); num < len; num++)
    {
        if(string[num] == '~')
        {
            if((num + 1) < len)
            {
                if(string[(num + 1)] == '~') return false;
            }
            count += 1;
        }
    }
    if((count % 2) > 0) return false;
    return true;
}

On testing, i got the following results:
~~ - false
~r~ - true
~r~~ - false
~~~~ - false (even though the count is even but it have an additional check over that)