[package]

name = "day19"

version = "0.1.0"

authors = ["Denys Levchenko <denis.levtchenko@gmail.com>"]

[dependencies]

use std::io::prelude::*;

use std::fs::File;

fn main() {

fn get_new_molecules(init_molecule: String, from: &str, to: &str) -> Vec<String> {

let splited_molecule: Vec<&str> = init_molecule.split(from).collect();

let molecule_len = splited_molecule.len();

(0..molecule_len - 1).map(|i| splited_molecule.iter()

.enumerate()

.map(|(splited_index, &splited_val)| {

if splited_index == i {

splited_val.to_string() + to

} else if splited_index != molecule_len - 1 {

splited_val.to_string() + from

} else {

splited_val.to_string()

}

}).collect::<Vec<String>>().concat())

.collect()

}

let replaced_molecule = get_new_molecules("HOHOH".to_string(), "H", "OO");

println!("{:?}", replaced_molecule);