Create the array of bytes data by encoding the string s in UTF-8.
New implementation

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Other implementations
using System.Text;
byte[] data = Encoding.UTF8.GetBytes(s);
data := []byte(s)
const data = new TextEncoder().encode(s);
  data: pbyte absolute s;
use v5.10;
use open ':std', ':encoding(UTF-8)';
use utf8;
my $text = 'Café';


my @utf8 = unpack('C*', $text);
use v5.10;
use open ':std', ':encoding(UTF-8)';
use utf8;
use Encode qw(encode);
my $text = 'Café';

my @utf8 = unpack 'C*', Encode::encode 'UTF-8', $text;

data = s.encode('utf8')
data = s.bytes
let data = s.into_bytes();