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Idiom #176 Hex string to byte array

From hex string s of 2n digits, build the equivalent array a of n bytes.
Each pair of hexadecimal characters (16 possible values per digit) is decoded into one byte (256 possible values).

for i := 0 to length(s) div 2 - 1 do
  a[i] := StrToInt('$'+Copy(s,2*(i)+1,2));
import "encoding/hex"
a, err := hex.DecodeString(s)
if err != nil {

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