Example 2Enter message to be encrypted: Dèyè mòn, gen mòn.Enter step size: -1ORIGINAL MESSAGEDèyè mòn, gen mòn.ENCRYPTED MESSAGECçxç lim, fdm lim.Enter message to be encrypted: Dèyè mòn, gen mòn.Enter step size: 0ORIGINAL MESSAGEDèyè mòn, gen mòn.ENCRYPTED MESSAGEDèyè mòn, gen mòn.Enter message to be encrypted: QUITExample 3Enter message to be encrypted: Perfer et obdura, dolor hic tib:proderit olim.Enter step size: 8ORIGINAL MESSAGEPerfer et obdura, dolor hic tibi proderit olim.ENCRYPTED MESSAGEXmznmz m| wjl)zi, lwtwz pąk |qją xzwlmzą| wtqu.Enter message to be encrypted: QUIT In cryptography, a Caesar cipher is a method of encryption where each character isreplaced by a corresponding character a defined number of steps away.Define a cryptographic function, ASCII_shift () that will take in two arguments, a stringand a step size. For every alphabetical character in the original string, the function willmake a new string which shifts each character in the original string by the defined stepsize, then print the new string. (You may use the exact comments below in your script.)# FUNCTION: ASCII_shift (original_string, step_size)# INPUT: original string and step size.# PROCESSING:Create a new variable, shift_string.Iterate over original_string.For each alphabetical character in original string, convertthe character into Unicode value, add the shift size,2323#32323convert new value into character, and add the new characterto the end of shift string.For each non-alphabetical character in the original string,232323keep the character the same in the shift_string.# OUTPUT: returns the shift_stringYou will use the ASCII_shift () function in your main () function. In main (), ask theuser to input a message to be encrypted and the step size. Print the original and encryptedmessages. The main () function will continually ask the user for inputs and cali theASCII_shift () function until the user enters the word QUIT (all capital) letters.Below are a few sample runnings in IDLE interactive mode. Underlined text indicatesuser input. You can assume there will be no data type entry errors from the user.Example 1Enter message to be encrypted: Hello World!Enter step size: 2ORIGINAL MESSAGEHello World!ENCRYPTED MESSAGEJgnng Yqtnf!Enter message to be encrypted: 251 Mercer St.Enter step size: 5ORIGINAL MESSAGE251 Mercer St.ENCRYPTED MESSAGE251 Rjwhjw Xy.Enter message to be encrypted: QUIT

Question

Accepted Answer

Note: I use C program to write this program.
C program:
C is a programming language developed by…