import { decode } from "https://deno.land/x/deno@v0.28.0/std/encoding/hex.ts";
Decode decodes src into decodedLen(src.length) bytes
returning the actual number of bytes written to dst.
Decode expects that src contains only hexadecimal characters and that src
has even length.
If the input is malformed, Decode returns the number of bytes decoded before
the error.