Task 1

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diff --git a/challenge-070/perlboy1967/perl/ch-1.pl b/challenge-070/perlboy1967/perl/ch-1.pl
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+#!/usr/bin/perl
+
+# Perl Weekly Challenge - 070
+#
+# Task 1 - Character Swapping
+#
+# Author: Niels 'PerlBoy' van Dijke
+
+use strict;
+use warnings;
+
+sub characterSwapping($$$);
+
+die "Minimal arguments is three" 
+  unless scalar(@ARGV) >=3 ;
+
+my ($S, $C, $O) = @ARGV;
+my $N = length($S);
+
+die "Invalid arguments given"
+  unless ($C >= 1 and 
+          $O >= 1 and 
+          $C <= $O and 
+          $C +$O <= $N and
+          $C <= $O);
+
+printf q{
+Input:
+  $S = '%s'
+  $C = %d
+  $O = %d 
+
+}, $S, $C, $O;
+
+my $s = characterSwapping($S, $C, $O);
+
+print qq{
+Output:
+  $s
+};
+
+
+sub characterSwapping($$$) {
+  my ($S, $C, $O) = @_;
+
+  my @s = split(//, $S);
+
+  print "Character Swapping:\n";
+
+  foreach my $i (1 .. $C) {
+    my @i = ($i % $N, ($i + $O) % $N);
+
+    print "  swap: $s[$i[0]] <=> $s[$i[1]] = ";
+
+    @s[@i] = @s[reverse @i];
+
+    print join('', @s)."\n";
+  }
+
+  return join('', @s);
+}