Challenge 2: Catch the Typo — Possible Solution
====================================================================

Given:
    use strict;
    use warnings;

    my $message = "Hello";
    print $mesage;   # typo: missing the "s" in "message"

The exact compile-time error Perl would raise:

    Global symbol "$mesage" requires explicit package name
    (did you forget to declare "my $mesage"?) at script.pl line 6.

WHY THIS WORKS AS AN ANSWER
------------------------------
This reuses the chapter's own warn-box example almost exactly —
$user_name / $usr_name became $message / $mesage here, but the
underlying mistake is identical: a variable name typo'd on its second
use.

The one-sentence explanation: use strict is what causes this to be a
hard compile-time ERROR rather than silently succeeding, because it
requires every variable to be explicitly declared (via my, our, or
local) before it can be used — and since $mesage (the typo) was never
declared anywhere, strict refuses to let the script run at all,
rather than allowing Perl's default permissive behavior of silently
treating $mesage as a brand-new, separate, empty variable the way the
chapter's own un-strict example showed happening.

This is the entire practical value of use strict the chapter
describes: turning a category of bug that would otherwise print
nothing (or the wrong thing) with no warning at all into an immediate,
specific, line-numbered error caught before the script ever runs.