public function  patchBook()
    {
        $all = fopen("district.txt","r");
        $div_cmp = "Division" ;
        $d_cmp = "District" ;
        $t_cmp = "Upazila" ;

        while(!feof($all))
        {
            $line = fgets($all);
            $div = "";
            $dist = "" ;
            $thana = "" ;
            $temp = "" ;
            $id_value = 0 ;

            for($i=0 ; $i<strlen($line) ; $i++)
            {
                if($line[$i] !== ' ') {
//                    if($id_value == 2)
//                        echo  $line[$i];

                    $temp .= $line[$i];
                }

                else {
                    if ($id_value == 0) {
                        if($div_cmp === $temp)
                        {
                            echo $div ;
                            echo " <--> ";
                            $id_value++;
                        }

                        else if(strlen($temp)>0) {
                            $div .= $temp;
                            $div .= " ";
                        }
                    }

                    else if($id_value == 1)
                    {
                        if($d_cmp === $temp)
                        {
                            echo $dist ;
                            echo " <--> ";
                            $id_value++;
                        }

                        else if(strlen($temp)>0) {
                            $dist .= $temp;
                            $dist .= " ";
                        }
                    }

                    else if($id_value == 2)
                    {
//                        if($t_cmp === $temp)
//                        {
//                            echo $thana ;
//                            echo " <--> ";
//                            $id_value++;
//                        }

                        if(strlen($temp) > 0) {
                            $thana .= $temp;
                            $thana .= " " ;
                        }
                    }

                    $temp = "" ;
                }
            }

            $district = new district;
            $district->district = $dist ;
            $district->upazila = $thana ;
            $district->save();
        }
    }