Added template for day12.

src/days/day12.rs

@@ -0,0 +1,9 @@
+use crate::error::AdventError;
+
+pub fn one() -> Result<u64, AdventError> {
+    Ok(0)
+}
+
+pub fn two() -> Result<u64, AdventError> {
+    Ok(0)
+}   

src/days/mod.rs

@@ -8,4 +8,5 @@ pub mod day7;
 pub mod day8;
 pub mod day9;
 pub mod day10;
-pub mod day11;
+pub mod day11;
+pub mod day12;

src/main.rs

@@ -22,6 +22,7 @@ fn main() -> Result<(), AdventError> {
         (day9::one as fn() -> Result<u64, AdventError>, day9::two as fn() -> Result<u64, AdventError>),
         (day10::one as fn() -> Result<u64, AdventError>, day10::two as fn() -> Result<u64, AdventError>),
         (day11::one as fn() -> Result<u64, AdventError>, day11::two as fn() -> Result<u64, AdventError>),
+        (day12::one as fn() -> Result<u64, AdventError>, day12::two as fn() -> Result<u64, AdventError>),
     ];
 
     if env::args().len() == 1 {