default and custom error pages response

+ refactoring in response.cpp (functions split)
+ added Client::clear()
+ added replace_all_substr() in utils.cpp

srcs/Client.cpp

@@ -45,9 +45,26 @@ void	Client::parse_request()
 	_parse_request_headers(list);
 	//body- message
 	_parse_request_body(pos +  4);
+
+	// add "raw_request.clear()" after parsing ? for little less memory usage ?
 }
 
+void	Client::clear()
+{
+	clear_request();
+	raw_request.clear();
+	response.clear();
+	status = 0;
+}
 
+void	Client::clear_request()
+{
+	_request.method = UNKNOWN;
+	_request.path.clear();
+	_request.version.clear();
+	_request.headers.clear();
+	_request.body.clear();
+}
 
 http_method	Client::get_method()  { return _request.method; }
 std::string	&Client::get_path()    { return _request.path; }