how to make a todo list in rust

main.rs
use std::fs::File;
use std::io::{self, Write, BufRead, BufReader};

fn main() {
    let mut tasks: Vec<String> = vec![];

    // Load tasks from file
    let file = File::open("tasks.txt");
    if let Ok(file) = file {
        let reader = BufReader::new(file);
        for line in reader.lines() {
            if let Ok(task) = line {
                tasks.push(task);
            }
        }
    }

    loop {
        println!("Todo List");
        println!("1. Add Task");
        println!("2. View Tasks");
        println!("3. Exit");

        let choice: i32 = get_user_input("Please enter your choice:");

        match choice {
            1 => {
                let task_name = get_user_input("Enter task name:");
                tasks.push(task_name);
            }
            2 => {
                println!("Tasks:");
                for (index, task) in tasks.iter().enumerate() {
                    println!("{}. {}", index + 1, task);
                }
            }
            3 => {
                // Save tasks to file
                let mut file = File::create("tasks.txt").expect("Unable to create file");
                for task in &tasks {
                    writeln!(file, "{}", task).expect("Unable to write task to file");
                }
                break;
            }
            _ => println!("Invalid choice. Please try again."),
        }
    }
}

fn get_user_input(message: &str) -> i32 {
    println!("{}", message);

    let mut input = String::new();
    io::stdin().read_line(&mut input).expect("Failed to read line");

    match input.trim().parse() {
        Ok(num) => num,
        Err(_) => {
            println!("Please enter a valid number.");
            get_user_input(message)
        }
    }
}
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