Decoder's main func

void decoder(string text){
    int smth=0;

        if(text.length()%8==0){
            sk = text.length()/8;
            for(int m=1;m<=sk;m++){
                hlp = text.substr(smth,8);
                alphabet(hlp);
                smth+=8;
            }
        }
        else{
            cout<<"\nCouldn't decode the text, please check it and try again.";
        }
}