Made fist day by myself :3

Cargo.lock

@@ -2,6 +2,10 @@
 # It is not intended for manual editing.
 version = 3
 
+[[package]]
+name = "day1"
+version = "0.1.0"
+
 [[package]]
 name = "tiesto"
 version = "0.1.0"

Cargo.toml

@@ -2,5 +2,5 @@
 
 members = [
 	"tiesto",
-
+	"day1",
 ]

day1/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "day1"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day1/src/main.rs

@@ -0,0 +1,47 @@
+use std::str::FromStr;
+use std::fs;
+
+fn main() {
+    const FILE_PATH: &str = "input.txt";
+    println!("Hi this is the fist day of AOC2022, first we will read the file {}", FILE_PATH);
+    let contents = fs::read_to_string(FILE_PATH)
+        .expect("Should have been able to read the file");
+    println!("The elf with the biggest calories is: {}", get_max_elf(&contents));
+}
+
+fn get_max_elf(input: &str) -> u32{
+    let binding = input.to_owned();
+    let input: Vec<&str> = binding.lines().collect();
+    let mut elfs = Vec::new();
+    let mut ptr: usize = 0;
+    elfs.push(0);
+    for line in input{
+        if line == "" {ptr+=1; elfs.push(0); continue;}
+        elfs[ptr] += u32::from_str(line).expect("all content must be numbers");
+    }
+    *elfs.iter().max().expect("there must be a maximum lol")
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+    #[test]
+    fn it_works() {
+        let input = r#"1000
+2000
+3000
+
+4000
+
+5000
+6000
+
+7000
+8000
+9000
+
+10000"#;
+        
+        assert_eq!(get_max_elf(input), 24000);
+    }
+}