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use strict;
use warnings;
...
    # Print blank lines between groups
    print "\n\n";
}

./images/IMG_7139.CR2: 1336823075
./images/IMG_7140.CR2: 1336823077
...
./images/IMG_7162.CR2: 1336823661
./images/IMG_7163.CR2: 1336823664
./images/IMG_7164.CR2: 1336823667