refactor: rename main! macro to solution!

src/template/commands/scaffold.rs

@@ -6,16 +6,16 @@ use std::{
 
 use crate::Day;
 
-const MODULE_TEMPLATE: &str = r#"pub fn part_one(input: &str) -> Option<u32> {
+const MODULE_TEMPLATE: &str = r#"advent_of_code::solution!(DAY_NUMBER);
+
+pub fn part_one(input: &str) -> Option<u32> {
     None
 }
 
 pub fn part_two(input: &str) -> Option<u32> {
     None
 }
 
-advent_of_code::main!(DAY_NUMBER);
-
 #[cfg(test)]
 mod tests {
     use super::*;

src/template/mod.rs

@@ -19,9 +19,9 @@ pub fn read_file(folder: &str, day: Day) -> String {
     f.expect("could not open input file")
 }
 
-/// main! produces a block setting up the input and runner for each part.
+/// Creates the constant `DAY` and sets up the input and runner for each part.
 #[macro_export]
-macro_rules! main {
+macro_rules! solution {
     ($day:expr) => {
         /// The current day.
         const DAY: advent_of_code::Day = advent_of_code::day!($day);