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my @vector1 = ( 2, -4, 2 );
my @vector2 = ( 5, -3, -6);

      return unless $ct1 && $ct1 == $ct2 && $ct2 == $ct3;

      my $sum = 0;
      foreach my $i ( 0 .. $#$x ){
        $sum += $x->[$i] * $y->[$i] * $z->[$i];
      }
      return $sum;

  my $sum = 0;
  $sum += $x->[$_] * $y->[$_] * $z->[$_] for 0 .. $#$x;
  return $sum;