practice code

 #include <arpa/inet.h>
#include <dirent.h>
#include <errno.h>
#include <limits.h>
#include <math.h>
#include <signal.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>

const char* lookup(const char* path)
{
    // TODO
    if (path == NULL)
    return NULL;



    int pathLength = strlen(path);
    char* extension = calloc(1, pathLength);



    extension = strchr(path, '.');



  if(extension != NULL)
  {
    if (strcasecmp(extension, ".css") == 0)
    {
        char* ret = "text/css";
        return ret;
    }
    else if (strcasecmp(extension, ".html") == 0)
    {
        char* ret = "text/html";
        return ret;
    }
    else if (strcasecmp(extension, ".gif") == 0)
    {
        char* ret = "image/gif";
        return ret;
    }
    else if (strcasecmp(extension, ".ico") == 0)
    {
        char* ret = "image/x-icon";
        return ret;
    }
    else if (strcasecmp(extension, ".jpg") == 0)
    {
        char* ret = "image/jpeg";
        return ret;
    }
    else if (strcasecmp(extension, ".js") == 0)
    {
        char* ret = "text/javascript";
        return ret;
    }
    else if (strcasecmp(extension, ".php") == 0)
    {
        char* ret = "text/x-php";
        return ret;
    }
    else if (strcasecmp(extension, ".png") == 0)
    {
        char* ret = "image/png";
        return ret;
    }
    else
    {
        return NULL;
    }
  }
    else
    {
    return NULL;
    }


}

int main()
{
char* line = "GET /hello.php?q=gilbert HTTP/1.1";

 int lineLength = strlen(line);
    int sp = 0;
    int sp2 = 0;

    char* method = calloc(1, lineLength);
    char* path = calloc(1, lineLength);
    char* http = calloc(1, lineLength);
    char* abs_path = calloc(1, lineLength);
    char* query = calloc(1, lineLength);

    for(int i = 0, j = 0; i < lineLength; i++)
    {
        if (line[i] == ' ')
        {
        sp = i + 1;
        break;
        }
        if(line[i] != ' ' && j < 10)
        {
            method[j] = line[i];
            j++;
        }
    }
    if(strcmp(method, "GET") != 0)
    {
        //error(405);
        //return false;
        printf("method is not GET, error 405\n");
    }


    for(int r = 0; sp < lineLength; sp++)
    {
        if (line[sp] == ' ')
        {
         sp2 = sp + 1;
        break;
        }
        if(line[sp] != ' ' && r < 50)
        {
            path[r] = line[sp];

            r++;
        }

    }


    if (path[0] != '/')
    {
        //error(501);
        //return false;
        printf("path doesn't begin with fslash, error 501\n");
    }


    for(int c = 0; c < strlen(path); c++)
    {
        if (path[c] == '\"')
        {
            //error(400);
            //return false;
            printf("path contains quotation mark, error 400\n");


        }
    }
     for(int w = 0; sp2 < lineLength; sp2++, w++)
    {
        if (line[sp2 != '\r'])
        {
        http[w] = line[sp2];
        }
    }
    if(strcmp(http, "HTTP/1.1") != 0)
    {
        //error(505);
        //return false;
        printf("HTTP version is not 1.1, error 505\n");
    }
   //strcpy(abs_path, path);


    //lets extract this .
    //getting query:

    char* qery = calloc(1, strlen(line));

    qery = strchr(path,'?');

   query = strchr(qery,'q');

   char* p = strchr(path, '?');

   *p = 0;

   char* pPosition = strchr(path, '.');
   const char* lokup = lookup(path);

   if(pPosition == NULL)
   {
       //error(404);
       //return false;
       printf("the path doesn't contain a . error 404\n");
   }
    else if(lokup == NULL)
    {
        //error(501);
        //return false;
        printf("the path extension is not valid here, error 501.\n");
    }

    strcpy(abs_path, path);






  // return true;
}