DELPHI dynamically create and release multiple EDIT control

unit Unit1;
 
interface
 
uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, ExtCtrls;
 
type
  TForm1 = class(TForm)
    pnl1: TPanel;
    btn1: TButton;
    btn2: TButton;
    procedure btn1Click(Sender: TObject);
    procedure btn2Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;
 
where
  Form1: TForm1;
  editm:array of tedit;
 
implementation
 
{$R *.dfm}
 
// dynamically create EDIT control 
Procedure TForm1.btn1Click (Sender: TObject);
 var
    i,d,j:integer;
begin
d:=0;
j:=3;
setlength(editm,j);
  for   i:=0   to   j-1   do
  begin
    editm[i]:=tedit.Create(self);
    editm[i].Parent:=pnl1;
    editm[i].Width:=120;
    editm[i].Height:=20;
    editm[i].Left:=0;
    editm[i].Top:=0+d;
    editm[i].Name:= 'edit'+inttostr(i);
    editm[i].Text:= 'edit'+inttostr(i);
    editm[i].Visible:=true;
    D: = D + 20 is ;
   End ;
 End ;
 // the EDIT control destruction created 
Procedure TForm1.btn2Click (Sender: TObject);
 var
  i:Integer;
begin
for i:=0 to 2 do
begin
editm[i].free;
end;
end;
 
end.