Testing Rust with writing to a file and formating functionallity

write_to_file.rs

fn main() {
    use std::fs::File;
    use std::io::prelude::*;
    use std::fmt;
    
    struct Info {
        name: String,
        age: i32,
        rating: i32,
    }

    impl fmt::Display for Info {
        // `f` is a buffer, this method must write the formatted string into it
        fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
            writeln!(f, "name: {}, age: {}, rating: {}", self.name, self.age, self.rating)
        }
    }

    
    let mut file = File::create("my_best_friends.txt").unwrap();

    for info in [
        Info { name: String::from("Abdulrhman A"), age: (30), rating: 100 },
        Info { name: String::from("Ali S"), age: (39), rating: 85 },
        Info { name: String::from("Waleed A"), age: (28), rating: 73 },
    ].iter() {
        let _ = writeln!(&mut file, "{}", *info);
    }
}