function mainFunc() public
    {
        uint len = 52;
        string memory alphabet = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
        charNumberPair[52] memory pairs;

        uint begin = 0;
        uint end = 2;

        for (uint i = 0; i < len; i++)
        {
            string memory temp = getSlice(begin, end, alphabet);
            pairs[i] = new charNumberPair(temp);
            begin++;
            end++;
        }

        for (uint i = 0; i < len; i++)
        {
            begin = 0;
            end = 2;
            for (uint i2 = 0; i2 < txtlength; i2++)
            {
                string memory temp = getSlice(begin, end, txt);
                string memory temp2 = pairs[i].getChar();
                if (compareStrings(temp2, temp))
                    {
                        pairs[i].incrementRepeatCount();
                    }
                begin++;
                end++;
            }
        }

        for (uint write = 0; write < len; write++)
            {
                for (uint sort = 0; sort < len - 1; sort++)
                {
                    uint256 t1 = pairs[sort].getRepeatCount();
                    uint256 t2 = pairs[sort + 1].getRepeatCount();
                    if (t1 > t2)
                    {
                        charNumberPair temp = pairs[sort + 1];
                        pairs[sort + 1] = pairs[sort];
                        pairs[sort] = temp;
                    }
                }
            }

    }