CS50 Ceaser

#include <stdio.h>
#include <cs50.h>
#include <ctype.h>
#include <string.h>
#include <stdlib.h>


int main(int argc, string argv[]);

int key;
int mushmouth; 
{
    string key = argv[1];
    if (argc==!6)
    {
    
        printf("Riddle me thus-wise and you'll have the key: How many geese-a-laying? \n");
        return 1; 
   }
   else
   {
       int key = atoi (key) %26 
       if key == 0
       printf("No, no, no, that's not the answer, try again my Chirstmas Carol addict! \n")
       
       break 
   }
    string wordz = GetString();
    if wordz = ! NULL 
    {
    for int ( i = 0, n = strlen(wordz) i < n; ii)
     {
         int c = 0;
         if (isupper (wordz[i]))
         {
             c = (((int) wordz[i] - 65 + k) % 26) + 65; 
             printf (%c, (char) c);
         }
             else
             printf (%c, wordz[i]);
            
            break 
         }
     }


}