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.

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