Add solver constants

src/solvers/cafeteria.rs

@@ -5,6 +5,10 @@ use std::io::BufRead;
 
 pub struct Cafeteria {}
 
+impl Cafeteria {
+    const INTERVAL_SPLIT_CHAR: char = '-';
+}
+
 impl Solver for Cafeteria {
     const PUZZLE_INDEX: u8 = 5;
     const PUZZLE_NAME: &'static str = "Cafeteria";
@@ -17,7 +21,8 @@ impl Solver for Cafeteria {
             .lines()
             .map_while(|x| x.ok().filter(|s| !s.is_empty()))
         {
-            let values: Vec<u64> = line.split('-').map_while(|s| s.parse().ok()).collect();
+            // TODO: This code should move into new common::interval::MultiInterval struct.
+            let values: Vec<u64> = line.split(Self::INTERVAL_SPLIT_CHAR).map_while(|s| s.parse().ok()).collect();
             let mut interval = Interval::new(values[0], values[1]);
 
             let mut to_delete = Vec::new();