Pset2 Caesar struggle but i gotta do it im from Rome

Question

Ave

thanks in advance for your help

total newbie trying to make pset2 caesar. here is the error

caesar.c:14:1: error: expected identifier or '(' {{ ^ 1 error generated.

here is the code

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

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


   int length;
    int k;
    int i;

{


    //only accept 2
if( argc != 2)
{
    printf("Wrong key/n");
  return 1;
}
else
{
    //get text

    string text = get_string();
    //conversion

       int k =atoi(argv[1]);

        for (int i = 0; length = strlen(text); i < length ; i++)

    {
        //check alphabetic
        if (isalpha (text[1]))
        {          //check lowercase 
            if(islower (text[1]))
            {
        printf("%c",((((text[1] -97)+k)%26)+97);
            }
    else
    {
        // else meaning uppercase
       printf("%c", (((text[1] -65)+k)%26)+97)
    }



         else
         {
         printf("c\, (text[1]")
}}
}}

Answer 1

It's a syntax/structure problem. When writing main(), the signature line must be followed immediately by the opening curly brace and not by a semicolon, as follows:

int main(int argc, string argv [])
{
    //program code
}

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Answer 2

 int length;
int k;
int i;


{

This brace is causing the issue.