unsigned search_eel (char *s, unsigned len)
{
    if (len<3)
        return len; // not found
    unsigned seen=0;
    for (unsigned i=0; i<len; i++)
    {
        char ch=s[i]; // this is single read operation
        if (seen==0 && ch=='e')
            seen=1;
        else if (seen==1 && ch=='e')
            seen=2;
        else if (seen==2 && ch=='l')
            return i-2; // found
        else
            seen=0;     // reset
    }
    return len; // not found
};