Can someone help me figure out the code and find the best way to solve it$?$

#include

#include $$cipher$.$h$$

$//$the code below is shown only to get started

int main$($void$)$

$//$ string with initialization

char alphabet$[]=$ ZYXWVUTSRQPONMLKJIHGFEDCBA $$;

$//$array declaration to hold a string

$//($of up to $225$ characters, plus $\backslash 0$ character$)$

char input$[256]$;

char output$[256]$

$//$print the alphabet

$//$we demarcate the string with quotation marks so space at

$//$ the start or end can be distinguished more clearly

printf$($

This is the alphabet: $\backslash \%$s$\backslash$

$,$ alphabet$)$;

$//$get input for the user

$//$we demarcate the string with quotation marks so space at

$//$the start or end can be distinguished more clearly

printf$($

This is the alphabet: $\backslash \%$s$\backslash$

$,$ alphabet$)$;

$//$ get input fo the user

$//$the scanf formatting read a string, including

$//$the blank space before the $\%,$ would clear the buffer first

printf$($

enter a string:$)$;

scanf$(\%[^$

$]$s$,$ input$)$;

printf$($ The string you entered was: $\%$s$\backslash$

$,$ input$)$;

$//$Examples; they are commented out since the functions are not implemented yet. They are included here to illustrate the function arguments and their use.

Substitution cipher: Encrypt the string $$input$$ and put the result in $$output$$ and put the result in $$output$.$ Use $$alphabet$$ as the key.

cipher$\_$substitution$($input$,$ output, alphabet, ENCRYPT$)$;

Enigma cipher: Encrypt the string $$input$$ and put the result in $$output$.$ The key is $1304.$

cipher$\_$enigma$($input$,$output,$1304,$ENCRYPT$)$;

$\}$

As you create the library for ciphers.h$,$ this format will help

$//$constant$.$ Do not modify these.

#define ENCRYPT $1$

#define DECRYPT $0$

$//$write you function prototype declarations here for the following functions. Do not include the declarations of any other helper functions you may create.

string$\_$length

index$\_$of$\_$char

cipher$\_$substitution

cipher$\_$enigma

Thank you!