Better name.

Cargo.lock

@@ -3,5 +3,5 @@
 version = 3
 
 [[package]]
-name = "_1_calorie_counting"
+name = "advent_of_code"
 version = "0.1.0"

Cargo.toml

@@ -1,5 +1,5 @@
 [package]
-name = "_1_calorie_counting"
+name = "advent_of_code"
 version = "0.1.0"
 edition = "2021"
 

src/main.rs

@@ -1,4 +1,4 @@
-use _1_calorie_counting::prob1;
+use advent_of_code::prob1;
 
 fn main() {
     let args: Vec<String> = std::env::args().collect();