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reRev        - 214365879
reSwap       - 214365879
...
ReSwap       28.3/s       580%     142%     120%       102%          9
+6%          89%   10%     --      -23%         -23%
SubstrRev    36.7/s       785%     214%     187%       162%         15
+5%         145%   43%    30%        --          -0%
SubstrSubstr 36.9/s       788%     215%     188%       163%         15
+6%         146%   44%    30%        0%           --

use strict;
use warnings;
...
    my $out = join q{}, @tmp;
    return $out;
}