Complete the C program message$\_$encipher.c$,$ which scans in a message and enciphers it$.$

Each message will consist of a total of $4$ letters. To encipher a message, we will scan in $4$ numbers to add to each of these letters.

For example, if we have the message

"comp"

And, we scanned in the following $4$ numbers:

$527-2$

Then, the message is enciphered to

$"$hqtn$"$

This is because:

$\text{'}$c$\text{'}+5=\text{'}$h$\text{'}$

$\text{'}$o$\text{'}+2=\text{'}$q$\text{'}$

$\text{'}$m$\text{'}+7=\text{'}$t$\text{'}$

$\text{'}$p$\text{'}+-2=\text{'}$n$\text{'}$

Pull up an ascii table if you want to double check this! You can do this with the command ascii $-$d run in the terminal.

In this exercise, you will only be given letters as input $($can be lower or uppercase!$)$ and will need to follow the rules above.

There are $3$ important notes on our ciphering technique: $-$ Input numbers can be negative, for example if we want to encipher $\text{'}$g$\text{'}$ with the number $-5,$ then we get $\text{'}$b$\text{'}$

$-$ If an enciphered letter goes outside the range of $"$a$-$z$"$ then it must wrap around. This means that if an input letter is $\text{'}$y$\text{'}$ and the corresponding input number is $4,$ then the enciphered letter is $\text{'}$c$\text{'}$

$-$ There is no limit on an input number. This means that we could have an input letter like $\text{'}$h$\text{'}$ with a corresponding input number $150$ and the corresponding enciphered letter would be $\text{'}$b$\text{'}$