If the first string (s1) is greater than the second string (s2), the backwards function will return
true, indicating that s1 should appear before s2 in the sorted array. For characters in
strings, “greater than” means “appears later in the alphabet than”. This means that the
letter "B" is “greater than” the letter "A", and the string "Tom" is greater than the string
"Tim". This gives a reverse alphabetical sort, with "Barry" being placed before "Alex", and so
on.