latest changes

src/main.rs

@@ -1,12 +1,15 @@
 pub mod vec3;
 pub mod color;
 pub mod ray;
+pub mod sphere;
+pub mod hittable;
+pub mod hittable_list;
 
 use std::{io::{BufWriter, Write}, fs::File};
 use crate::{
     vec3::*,
     color::*,
-    ray::*
+    ray::*,
 };
 
 fn hit_sphere(center: &Point3, radius: f64, r: &Ray) -> f64 {