The Weekly Challenge - 255

TASK #1: Odd Character
You are given two strings, $s and $t. The string $t is generated using the shuffled characters of the string $s with an additional character. Write a script to find the additional character in the string $t.

Here my solution:

#!/usr/bin/perl
use strict;
use warnings;

sub odd_char {
    my ($s, $t) = @_;
	
    if (length($t) == (length($s) + 1)) {	
        # the one that is not replaced, is the additional character!		
        $t =~ s/$_//i for split('', $s);
        print("$t\n");
    }    
    else {
        print("No valid input!");    
    }
}

# TESTS

my ($s, $t);

# Example 1
$s = "Perl";
$t = "Preel";
odd_char($s, $t); # Output: e

# Example 2
$s = "Weekly";
$t = "Weeakly";
odd_char($s, $t); # Output: a

# Example 3
$s = "Box";
$t = "Boxy";
odd_char($s, $t); # Output: y