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december_2_1/Cargo.toml

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+[package]
+name = "december_2_1"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

december_2_1/src/main.rs

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+use std::fs::File;
+use std::io::{BufReader};
+use std::io::prelude::*;
+
+fn main(){
+    let file = File::open("./input.txt").expect("Read failed");
+    let reader = BufReader::new(file);
+
+    let mut current_depth = 0;
+    let mut current_horizontal = 0;
+
+    let all_lines = reader.lines();
+
+
+    for line in all_lines{
+        let line_as_string = line.unwrap();
+        let split_line = line_as_string.split_whitespace().collect::<Vec<&str>>();
+        let direction = split_line[0];
+        let distance = split_line[1].parse::<i32>().unwrap();
+
+        match direction {
+            "forward" => current_horizontal += distance,
+            "down" => current_depth += distance,
+            "up" => current_depth -= distance,
+            _ => println!("You should never be here")
+        }
+    }
+
+
+
+    println!("Depth: {}, Horizontal: {}, Result: {}", current_depth, current_horizontal, current_horizontal*current_depth)
+
+
+
+}