finish day 1

.gitignore

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+/target
+/.idea/

Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "advent-of-code-2022"
+version = "0.1.0"

Cargo.toml

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+[package]
+name = "advent-of-code-2022"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

src/day_1.rs

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+use std::fs;
+
+pub fn day_1() -> String {
+    let input = fs::read_to_string("input/day_1.txt").unwrap();
+
+    let elves: Vec<&str> = input.split("\n\n").collect();
+
+    let mut highest_calorie_count: u64 = 0;
+
+    for meals in elves.iter() {
+        let mut elf_calorie_count= 0;
+
+        for meal in meals.split_whitespace() {
+            elf_calorie_count += meal.parse().unwrap_or(0);
+        }
+
+        if elf_calorie_count > highest_calorie_count {
+            highest_calorie_count = elf_calorie_count;
+        }
+    }
+
+    format!("{highest_calorie_count}")
+}

src/main.rs

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+mod day_1;
+
+fn main() {
+    println!("{}", day_1::day_1());
+}