Remove split char parameter from Point2 and Point3 constructors

src/solvers/playground.rs

@@ -8,11 +8,10 @@ pub struct Playground {
 }
 
 impl Playground {
-    const POINT_SPLIT_CHAR: char = ',';
     const CIRCUITS_TAKE: usize = 3;
 
-    pub fn new(connections: Option<usize>) -> Playground {
-        Playground {
+    pub fn new(connections: Option<usize>) -> Self {
+        Self {
             connections: connections.unwrap_or(1000),
         }
     }
@@ -21,7 +20,7 @@ impl Playground {
     fn junction_boxes<R: BufRead>(reader: R) -> Vec<Point3> {
         let mut junction_boxes = Vec::new();
         for line in reader.lines().map_while(Result::ok) {
-            junction_boxes.push(Point3::from_line(&line, Self::POINT_SPLIT_CHAR));
+            junction_boxes.push(Point3::from_line(&line));
         }
         junction_boxes
     }