Pset6 lookup and parse

/**
 * Returns MIME type for supported extensions, else NULL.
 */
const char* lookup(const char* path)
{
    // char pointer to find dot
    char* dot_ptr;

    // array to store file type extension
    char ext[6];

    int i = 0;

     for(dot_ptr = strrchr(path,'.'); *dot_ptr != '\0'; dot_ptr++)
    {

        ext[i] = *dot_ptr;
        i++;
    }

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

/**
 * Parses a request-line, storing its absolute-path at abs_path
 * and its query string at query, both of which are assumed
 * to be at least of length LimitRequestLine + 1.
 */
bool parse(const char* line, char* abs_path, char* query)
{
    char* ptr_line;

    // counter for space
    int sp_count = 0;

    for(ptr_line = strchr(line,'G'); *ptr_line != 13; ptr_line++) // 13 = CR
    {
        if(*ptr_line == 32) // equals to space
            sp_count++;
    }

    if(sp_count != 2)
    {
        error(400);
        return false;
    }

    char get[] = "GET ";

    // compare 3 character between line and get
    if(strncmp(get, line, 4) != 0)
    {
        error(405);
        return false;
    }

    // pointer for first space
    char* sp_ptr;

    sp_ptr = strchr(line, 32);
    sp_ptr++;

    if(*sp_ptr != '/')
    {
        error(501);
        return false;
    }

    while(*sp_ptr != 32) // space
    {
        if(*sp_ptr == 34) // double quotation
        {
            error(400);
            return false;
        }
        sp_ptr++;
    }

    // one character forward
    sp_ptr++;

    char http[] = "HTTP/1.1";

    if(strncmp(sp_ptr, http, 8) != 0)
    {
       error(505);
       return false;
    }

    char ab_pass[LimitRequestLine+1];
    int i = 0;
    char* slash_ptr;
    slash_ptr = strchr(line, '/');

    while(*slash_ptr != 32) // 32 = space
    {
        ab_pass[i] = *slash_ptr;
        i++;
        slash_ptr++;
    }

    strcpy(abs_path, ab_pass);

    //array to store query
    char qu[LimitRequestLine+1];

    //pointer of ?
    char* quest_ptr = strchr(line, '?');

    if(quest_ptr == NULL)
        qu[0] = '\0';

    //one byte forward
    quest_ptr++;

    int index = 0;
    if(*quest_ptr == 32) // 32 = space
        qu[0] = '\0';
    else
    {
        while(*quest_ptr != 32)
        {
            qu[index] = *quest_ptr;
            index++;
            quest_ptr++;
        }
    }

    strcpy(query, qu);

    return true;
}