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+#!perl
+use strict;
+use warnings FATAL => qw(all);
+
+=prompt
+You are given a string, $str and a character in the given string, $char.
+Write a script to reverse the prefix upto the first occurrence of the given $char in the given string $str and return the new string.
+
+Example 1
+
+Input: $str = "programming", $char = "g"
+Output: "gorpramming"
+
+Reverse of prefix "prog" is "gorp".
+
+Example 2
+
+Input: $str = "hello", $char = "h"
+Output: "hello"
+
+Example 3
+
+Input: $str = "abcdefghij", $char = "h"
+Output: "hgfedcbaij"
+
+Example 4
+
+Input: $str = "reverse", $char = "s"
+Output: "srevere"
+
+Example 5
+
+Input: $str = "perl", $char = "r"
+Output: "repl"
+
+=cut
+
+
+
+
+use Test2::V0 -no_srand => 1;
+
+is(reverse_prefix("programming", "g"), "gorpramming", "Example 1");
+is(reverse_prefix("hello", "h"), "hello", "Example 2");
+is(reverse_prefix("abcdefghij", "h"), "hgfedcbaij", "Example 3");
+is(reverse_prefix("reverse", "s"), "srevere", "Example 4");
+is(reverse_prefix("perl", "r"), "repl", "Example 5");
+done_testing();
+
+sub reverse_prefix 
+{
+     my ($str, $char) = @_;
+     my $idx = index($str, $char, 0);
+     return reverse(substr($str, 0, $idx + 1)) . substr($str, $idx + 1);
+}