2021 Day 2 done in Rust

Code is currently fairly ugly, will try to refactor in a more functional fashion

2021/Day 2/rust_solution/Cargo.lock

@@ -0,0 +1,5 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "rust_solution"
+version = "0.1.0"

2021/Day 2/rust_solution/Cargo.toml

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+[package]
+name = "rust_solution"
+version = "0.1.0"
+authors = ["Teo-CD"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

2021/Day 2/rust_solution/src/main.rs

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+use std::fs;
+
+fn first_puzzle(input: &String) {
+    let mut position = [0; 2];
+    for line in input.lines() {
+        if line.contains("forward") {
+            // Surely there is a better way to parse a string for an integer ?
+            position[0] += line.rsplit(' ').next().unwrap().parse::<i32>().unwrap();
+        } else if line.contains("up") {
+            position[1] -= line.rsplit(' ').next().unwrap().parse::<i32>().unwrap();
+        } else if line.contains("down") {
+            position[1] += line.rsplit(' ').next().unwrap().parse::<i32>().unwrap();
+        }
+    }
+
+    println!("Position : {}, {}", position[0], position[1]);
+    println!("Multiplied : {}", position[0] * position[1]);
+}
+
+fn second_puzzle(input: &String) {
+    let mut position = [0; 3];
+    for line in input.lines() {
+        if line.contains("forward") {
+            let forward_move = line.rsplit(' ').next().unwrap().parse::<i32>().unwrap();
+            position[0] += forward_move;
+            position[1] += forward_move * position[2];
+        } else if line.contains("up") {
+            position[2] -= line.rsplit(' ').next().unwrap().parse::<i32>().unwrap();
+        } else if line.contains("down") {
+            position[2] += line.rsplit(' ').next().unwrap().parse::<i32>().unwrap();
+        }
+    }
+
+    println!("Position : {}, {}", position[0], position[1]);
+    println!("Multiplied : {}", position[0] * position[1]);
+}
+
+fn main() {
+    let contents = fs::read_to_string("../input.txt").expect("Could not open file.");
+    first_puzzle(&contents);
+    second_puzzle(&contents);
+    0;
+}