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use strict;
use warnings;
...
    my $input = shift;
    return join(' ', unpack('(H2)*', $input)), "\n";
}

000000 c3 a4 c3 b6 c3 bc c3 84 c3 96 c3 9c c3 9f 0d 0a

string: e4 f6 fc c4 d6 dc df 0a
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000000 1c 25 f1 00 1c 25 c2 00 1c 25 5d 25 1c 25 e4 00
000010 1c 25 fb 00 1c 25 a3 00 1c 25 92 01 0d 00 0a 00