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    $_='gcc 92 !$* % "awk in I$: ar& $:a"';

    foreach (/(\S)/g) {
...
    y;1;#;;
    print;

    $_='gcc 92 !$* % "awk in I$: ar& $:a"';

    foreach $char (/\S/g) { # Capturing parens not needed
...
    tr/1/#/;
    print $_;

    $str.= substr(unpack("B*",pack(n,unpack("c",$char))),-4);
    
    unpack("c",$char) # is the same as
...

    substr(..., -4)   # Get the last 4 chars:        0111

    01110011001110010010
    00010100101001010010
    00010111101110011110
    10010100101000010010
    01100100101000010010

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