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}")
}