Challenge 1: A Personalized Greeting — Possible Solution
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use strict;
use warnings;
use feature 'say';

my $name = "Ada";
my $city = "London";

say "$name lives in $city.";

Output:
Ada lives in London.

WHY THIS WORKS AS AN ANSWER
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my $name = "Ada"; and my $city = "London"; reuse the chapter's own
scalar-declaration pattern exactly — $ sigil, my for lexical scope
(the chapter's own recommended default), and a double-quoted string
literal for each value.

"$name lives in $city." reuses the chapter's own string interpolation
example directly — because the surrounding string uses double quotes,
both $name and $city are expanded to their actual values ("Ada" and
"London") automatically, producing the full sentence in a single
say call rather than needing separate concatenation with the .
operator for each variable.

This is deliberately the "idiomatic Perl, preferred over
concatenation" approach the chapter calls out — the same sentence
built instead as "say $name . ' lives in ' . $city . '.';" would work
identically but is exactly the more cluttered alternative the chapter
recommends against for anything with more than one or two variables.