use std::io::{self, Write};
use chem_eq::Equation;
fn main() -> io::Result<()> {
let mut input = String::default();
print!("Input equation: ");
io::stdout().flush()?;
io::stdin().read_line(&mut input)?;
let eq = Equation::new(input.as_str()).unwrap();
println!("eq = {:?}", eq);
println!("back = {}", eq);
Ok(())
}