You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: gui_header.rs
    path of file: ./repos/czkawka/czkawka_gui/src/gui_structs
    
    the code of the file until where you have to start completion: use gtk4::prelude::*;

use crate::help_functions::set_icon_of_button;
use crate::{flg, CZK_ICON_INFO, CZK_ICON_SETTINGS};

#[derive(Clone)]
pub struct Gui
    
    pub fn create_from_builder(builder: &gtk4::Builder) -> Self {
        let button_settings: gtk4::Button = builder.object("button_settings").unwrap();
        let button_app_info: gtk4::Button = builder.object("button_app_info").unwrap();

        set_icon_of_button(&button_settings, CZK_ICON_SETTINGS);
        set_icon_of_button(&button_app_info, CZK_ICON_INFO);

        Self { button_settings, button_app_info }
    }