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Instead of changing the code of the snippet, consider creating another Go implementation.

Other implementations
s := format('%.3d',[i]);
s = "%03d" % i
let s = format!("{:03}", i);
import std.format : format;
string s = format("%03d", i);
s = format('03d', i)
$s = sprintf('%03d', $i);
String s = String.format("%03d", i);
my $s = sprintf '%03d', $i;
write (unit=s,fmt='(I0.3)') i
string s = string.Format("{0:000}",i);
(def s (format "%03d" i))
let s = i.toString();
  s = ('00'+i).slice(-3);