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: main.rs
    path of file: ./repos/game-dev-with-rust/ping_pong/src
    
    the code of the file until where you have to start completion: mod ball;
mod constants;
mod main_state;
mod player;
mod racket;

use crate::main_state::MainState;
use ggez;
use ggez::graphics::set_window_title;
use ggez::{event, ContextBuilder, GameResult};
use std::{env, path};

fn main() -> GameResult {
    let resource_dir = if let Ok(manifest_dir) = env::var("CARGO_MANIFEST_DIR") {
        let mut path = path::PathBuf::from(manifest_dir);
        path.push("resources")
    
fn main() -> GameResult {
    let resource_dir = if let Ok(manifest_dir) = env::var("CARGO_MANIFEST_DIR") {
        let mut path = path::PathBuf::from(manifest_dir);
        path.push("resources");
        path
    } else {
        path::PathBuf::from("./resources")
    };

    let (mut context, event_loop) = ContextBuilder::new("Ping_Pong_0", "BurakS")
        .add_resource_path(resource_dir)
        .build()
        .expect("There is a problem for creating context");
    set_window_title(&context, "PING_PONG");
    let state = MainState::new(&mut context);
    event::run(context, event_loop, state);
}