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+#!perl
+use strict;
+use warnings FATAL => qw(all);
+
+=prompt
+You are given a string containing only lower case English letters and ?.
+Write a script to replace all ? in the given string so that the string doesn't contain consecutive repeating characters.
+
+Example 1
+
+Input: $str = "a?z"
+Output: "abz"
+
+There can be many strings, one of them is "abz".
+The choices are 'a' to 'z' but we can't use either 'a' or 'z' to replace the '?'.
+
+
+Example 2
+
+Input: $str = "pe?k"
+Output: "peak"
+
+
+Example 3
+
+Input: $str = "gra?te"
+Output: "grabte"
+=cut
+
+use Test2::V0 -no_srand => 1;
+
+is(replace_question_marks("a?z"), "abz", "Example 1");
+is(replace_question_marks("pe?k"), "peak", "Example 2");
+is(replace_question_marks("gra?te"), "grabte", "Example 3");
+is(replace_question_marks("gra?te?"), "grabtec", "Example 4");
+is(replace_question_marks("a??z"), "abcz", "Example 5");
+is(replace_question_marks("abc"), "abc", "Example 6");
+done_testing();
+
+sub replace_question_marks
+{
+     my $str = $_[0];
+     for my $ltr ( 'a' .. 'z' )
+     {
+          my $copy = $str;
+          $copy =~ s/(\?)/$ltr/;
+          if ( $copy !~ /(?<char>.)\k<char>/)
+          {
+               $str = $copy;
+          }
+          if ($str !~ /\?/)
+          {
+               return $str;
+          }
+     }
+}