Write a short SAD program into a file and name the file according to our standard convention but with .sad extension, hence name it Lab_12_InitialName.sed.

You program should perform following operations on a file that I will use to test it:

1) Substitute all instances of cst 3523 with CST-3523 2) Remove all empty lines from the file 3) Insert your name before the first line of the file 4) Add the line stating your name as the last line of the file

Make sure to comment your code.