Move code into a single cargo module with an execution harness.

2022/day02/src/main.rs

@@ -1,58 +0,0 @@
-use std::io;
-use std::io::prelude::*;
-use std::fs::File;
-
-fn read_lines(filename: &str) -> io::Result<io::Lines<io::BufReader<File>>> {
-    let file = File::open(filename)?;
-    Ok(io::BufReader::new(file).lines())
-}
-
-fn print_step(step: i8, value: u64) {
-    println!("Step {} solution: {}", step, value);
-}
-
-fn main() -> Result<(), io::Error> {
-    let mut score1: u64 = 0;
-    let mut score2: u64 = 0;
-
-    for line in read_lines("input.txt")? {
-        let text = line?;
-        let opp = parse_move(text.chars().nth(0).unwrap());
-
-        score1 += step1(opp, text.chars().nth(2).unwrap());
-        score2 += step2(opp, text.chars().nth(2).unwrap());
-    }
-
-    print_step(1, score1);
-    print_step(2, score2);
-    Ok(())
-}
-
-fn step1(opp: i8, text: char) -> u64 {
-    let me = parse_move(text);
-    return match me - opp {
-        1 | -2 => me + 6,
-        0 => me + 3,
-        -1 | 2 => me,
-        _ => panic!("Received impossible result in a match."),
-    } as u64;
-}
-
-fn step2(opp: i8, text: char) -> u64 {
-    return match text {
-        'X' => ((opp + 4) % 3) + 1,
-        'Y' => opp + 3,
-        'Z' => (opp  % 3) + 7,
-        _ => panic!("Received impossible strategy code."),
-    } as u64;
-}
-
-// Parses the second command in the input incorrectly.
-fn parse_move(x: char) -> i8 {
-    return match x {
-        'A' | 'X' => 1,
-        'B' | 'Y' => 2,
-        'C' | 'Z' => 3,
-        _ => 0,
-    };
-}