extern crate chrono;

use std::fs::OpenOptions;
use std::io::{self, BufReader, BufWriter};
use std::io::prelude::*;
use std::env;

const FILENAME: &str = "NOTES.TXT";

fn show_notes() -> Result<(), io::Error> {
    let file = OpenOptions::new()
        .read(true)
        .create(true)