Write a program to decrypt a message that is encrypted with this algorithm

input length for the string is no more than $1000$ characters.

input string contains only lowercase alphabetic letters.

The program should include the following function: void decrypt$($char $*$input$,$ char $*$output$)$; The function expects input contain the input string and output stores the decrypted string.This function should use pointer arithmetic$-$ DO NOT USE subscripting

String library functions are NOT allowed.

main function calls the decrypt function and displays the output.

Follow the format of the examples below.

Example #$1$

Enter message: siisss

Output: sis