public String guess(Character c) {
        if (c==null)
        {
            return theword ;
        }
        else if (gusess<maxnumber)
        {
            char k=Character.toUpperCase(c);
            char t=Character.toLowerCase(c);

            if (newwords[i].indexOf(c)>0||newwords[i].indexOf(t)>0||newwords[i].indexOf(k)>0)
            {
                for (int j=0 ; j<newwords[i].length();j++)
                {
                    if(newwords[i].charAt(j)==c)
                    {
                        theword=theword.substring(0, j)+c;
                    }
                }
                return theword ;
            }
            else
            {
                gusess++;
                return theword;
            }
        }
        else
        {
            return null ;
        }
    }