As you’re a very friendly person, you would like to send a birthday note to all the friends you have. But you have a lot of friends and a bit lazy, it may take some times to write all the notes by hand.
The good news is that computers can do it automatically for you.
Imagine you have a flat file with all your friends :
last_name, first_name, date_of_birth, email Doe, John, 1982/10/08, john.doe@foobar.com Ann, Mary, 1975/09/11, mary.ann@foobar.com
And you want to send them a happy birthday email on their birth date :
Subject: Happy birthday! Happy birthday, dear <first_name>!
How would this software look like ? Try to implement it so you can easily change :