Create ch-2.pl

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+#!perl
+use strict;
+use warnings FATAL => qw(all);
+
+=prompt
+You are given two strings, source and target.
+Write a script to find out if the given strings are Buddy Strings.
+If swapping of a letter in one string make them same as the other then they are `Buddy Strings`.
+Example 1
+Input: $source = "fuck"
+       $target = "fcuk"
+Output: true
+
+The swapping of 'u' with 'c' makes it buddy strings.
+
+
+Example 2
+
+Input: $source = "love"
+       $target = "love"
+Output: false
+
+
+Example 3
+
+Input: $source = "fodo"
+       $target = "food"
+Output: true
+
+
+Example 4
+
+Input: $source = "feed"
+       $target = "feed"
+Output: true
+=cut
+
+# use feature 'state';
+
+
+use List::Util qw(first);
+use constant { true => 1, false => 0 };
+
+use Test2::V0 -no_srand => 1;
+
+is(buddy_strings("fuck", "fcuk"), true, 'Example 1');
+is(buddy_strings("love", "love"), false, 'Example 2');
+is(buddy_strings("fodo", "food"), true, 'Example 3');
+is(buddy_strings("feed", "feed"), true, 'Example 4');
+done_testing();
+
+sub buddy_strings
+{
+     my ($str_1, $str_2) = @_;
+     if ( length($str_1) != length($str_2) )
+     {
+          return false;
+     }
+     my (%ltr_1, %ltr_2);
+     $ltr_1{$_}++ for split(//, $str_1);
+     $ltr_2{$_}++ for split(//, $str_2);
+     my @standard = sort {$a cmp $b} keys %ltr_1;
+     if ( join('', @standard) ne join('', sort {$a cmp $b} keys %ltr_2) )
+     {
+          return false;
+     }
+     if ( join('-', @ltr_1{@standard}) ne join('-', @ltr_2{@standard}) )
+     {
+          return false;
+     }
+     if ( $str_1 eq $str_2)
+     {
+          if ( defined first { $_ > 1 } values %ltr_1 )
+          {
+               return true;
+          }
+          else
+          {
+               return false;
+          }
+     }
+     return true;
+}