#!/usr/bin/perl

use warnings;
use strict;

my @data;
my $file      = 'mailbox.txt';
my $delimiter = '\s{2,}';
my $columns   = 2;

open(my $fh,'<',$file) or die $!;
while(my $line = <$fh>) {  # alles was unten in __DATA__ steht symbolisiert eine Datei
    chomp $line;
    my @array = (split(/$delimiter/,$line))[0..($columns-1)]; 

    foreach (@array) {
        s%^\s+%%g; # fuehrende und
        s%\s+$%%g; # abschliessende Blanks entfernen
    } # foreach
  
    push(@data,[@array]);
} # while
close $fh;

my $format = '';

for my $i(0..scalar(@{$data[0]})-1){
    my $max = find_longest(map{$_->[$i]}@data);
    $format .= '%-'.$max.'s ';
}

for my $entry(@data){
    print sprintf($format . "<<\n",@$entry);
}

sub find_longest{
    my $longest = 0;
    for(@_){
        my $length = length($_);
        $longest = $length if($length > $longest);
    }
 
    return $longest;
}