Hi, I don't understand what should I add to my current code in order to do what Question 6 ask. Thanks!

6.(2 Points) The program should be able to read multiple lines, encrypting and displaying one line at a time, till it runs out of input/reaches EOF (can be simulated by pressing CTRL+D at the keyboard input in an empty line). If you are using the tester script, you shouldn't have to do CTRL+D (if you do, there is an issue with your implementation). The program should terminate with return code O for any sucessfull execution. $ ./caesarcipher 5 this is a secret message ymnx nx f xjhwjy rjxxflj delete after reading ijqjyj fkyju wjfinsl $ echo $? 7.(1 Point) The program should only encrypt lowercase english alphabets (a-z) and should merely print an other letters, numbers, white space characters, etc., as is. $ ./caesarcipher 6 Hello there! How is COMP206? Hkrru znkxk! Huc oy COMP206