pset6 load changed and lookup, indexes

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;

    dot_ptr = strrchr(path,'.');

    do
    {
        ext[i] = *dot_ptr;
        i++;
        dot_ptr++;
    }while(*dot_ptr != '\0');

    ext[i] = '\0';

    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;
}

bool load(FILE* file, BYTE** content, size_t* length)
{

    int counter = 0;

    BYTE* ptr;

    ptr = (BYTE *)malloc(sizeof(BYTE));

    while(fread(ptr, sizeof(BYTE), 1, file) == 1)
    {
        counter++;
        ptr = (BYTE *)realloc(ptr,sizeof(BYTE)*(counter + 1));

    }

    *content = ptr;
    *length = counter;
     return true;
}

char* indexes(const char* path)
{
    int res_p; // store access return integer
    int res_h;

    char* php = NULL;
    char* html= NULL;

    strcpy(php, path);
    strcat(php, "index.php");
    const char* php_c =(const char*)php;

    strcpy(html, path);
    strcat(html, "index.html");
    const char* html_c =(const char*)html;

    char* path_p = malloc(strlen(path) + 1 + 9);
    strcpy(path_p, path);
    strcat(path_p, "index.php");

    char* path_h = malloc(strlen(path) + 1 + 10);
    strcpy(path_h, path);
    strcat(path_h, "index.html");

    res_p = access(php_c, F_OK);
    res_h = access(html_c, F_OK);

    if (res_p == 0)
        return path_p;
    else
    {
        if (res_h == 0)
            return path_h;
        else
            return NULL;
    }
}