Task 1: "Reverse Words

You are given a string $S.

Write a script to reverse the order of words in the given string. The
string may contain leading/trailing spaces. The string may have more
than one space between words in the string. Print the result without
leading/trailing spaces and there should be only one space between words.

Example 1:

	Input: $S = "The Weekly Challenge"
	Output: "Challenge Weekly The"

Example 2:

	Input: $S = "    Perl and   Raku are  part of the same family  "
	Output: "family same the of part are Raku and Perl"
"

My notes: looks straightforward.


Task 2: "Edit Distance

You are given two strings $S1 and $S2.

Write a script to find out the minimum operations required to convert
$S1 into $S2. The operations can be insert, remove or replace a
character. Please check out 
https://en.wikipedia.org/wiki/Edit_distance
for more information.

Example 1:

	Input: $S1 = "kitten"; $S2 = "sitting"
	Output: 3

	Operation 1: replace 'k' with 's'
	Operation 2: replace 'e' with 'i'
	Operation 3: insert 'g' at the end

Example 2:

	Input: $S1 = "sunday"; $S2 = "monday"
	Output: 2

	Operation 1: replace 's' with 'm'
	Operation 2: replace 'u' with 'o'
"

My notes: reading the Wikipedia page, the naive recursive implementation
sounds good enough to me, even though it's hideously inefficent.
The various iterative versions sound clever, especially the one which
only stores two rows, but I can't be bothered.

(note that there are several CPAN modules which do this, but solving a
Perl Challenge by "use Text::Levenshtein" seems like cheating).