Write a C++ program that implements QuickSort on an array of pointers to
structs that represent people.

Your program should be able to take the contents of any one of these files
  /home/118/database1.txt
  /home/118/database2.txt
  /home/118/database3.txt
  /home/118/database5.txt
  /home/118/database10.txt
  /home/118/database20.txt
  /home/118/database30.txt
  /home/118/database50.txt
  /home/118/database100.txt
and sort them so that the people appear in alphabetical order of their names.
(Sort primarily on last names. When two people have the same last name, order
them based on their first names. If two people have the same first and last
names, then their ordering doesn't matter)