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h:\>perl benchmark.pl
...
Benchmark: timing 100000 iterations of trimall_v1, trimall_v2...
trimall_v1: 13 wallclock secs (13.29 usr +  0.00 sys = 13.29 CPU)
trimall_v2: 12 wallclock secs (11.74 usr +  0.01 sys = 11.75 CPU)

#!/usr/bin/perl -w

...
    }
    return wantarray ? @out : $out[0];
}