read data from a base64 encoded binary pdf file, format it and map it to JSON and save that as a UTF-8 text file

use std::fs::File;
use std::io::prelude::*;

fn main() {
    let path = "file.pdf";
    let mut file = File::open(&path).unwrap();
    let mut contents = String::new();
    file.read_to_string(&mut contents).unwrap();
    let data = base64::decode(&contents).unwrap();
    let file = File::create("data.json").unwrap();
    let mut writer = BufWriter::new(file);
    let json = format!("{{\n\"data\": [{}]\n}}", data.iter().map(|x| format!("{}", x)).collect::<Vec<String>>().join(", "));
    let _ = writer.write_all(json.as_bytes());
    let _ = writer.flush();
}