Verificando a validade de cgc e cfp ii

Function CalculaCnpjCpf(Numero : String) : String;
var
i,j,k, Soma, Digito : Integer;
CNPJ : Boolean;
begin
Result := Numero;
case Length(Numero) of
9:
CNPJ := False;
12:
CNPJ := True;
else
Exit;
end;
for j := 1 to 2 do
begin
k := 2;
Soma := 0;
for i := Length(Result) downto 1 do
begin
Soma := Soma + (Ord(Result[i])-Ord('0'))*k;
Inc(k);
if (k > 9) and CNPJ then
k := 2;
end;
Digito := 11 - Soma mod 11;
if Digito >= 10 then
Digito := 0;
Result := Result + Chr(Digito + Ord('0'));
end;
end;