void SecondTree::printBT(string sp, string sn, Node * v)
{
    string cr,cl,cp;
    cr = cl = cp = "  ";
    cr[0] = 218; cr[1] = 196;
    cl[0] = 192; cl[1] = 196;
    cp[0] = 179;
    string s;

    if(v)
    {
        s = sp;
        if(sn == cr) s[s.length() - 2] = ' ';
        printBT(s + cp, cr, v->right);

        s = s.substr(0,sp.length()-2);
        cout << s << sn << v->key << ":" << v->balance << endl;

        s = sp;
        if(sn == cl) s[s.length() - 2] = ' ';
        printBT(s + cp, cl, v->left);
    }
}