fix by cargo

src/main.rs

@@ -1,11 +1,10 @@
 mod polygon_draw;
-use polygon_draw::{Polygon, PolygonFrame};
+use polygon_draw::Polygon;
 
 mod music;
 use music::Music;
 
 mod utils;
-use utils::string_to_color;
 
 use std::fs;
 
@@ -18,7 +17,6 @@ use iced::{
     },
 };
 
-use serde::{Deserialize, Serialize};
 
 use std::f32::consts::PI;
 use std::time::Instant;