Fix clippy errors

src/render.rs

@@ -1,12 +1,28 @@
 use ansi_term::Color::RGB;
-use crate::{consts, Material as _, SimState};
+use crate::{Material as _, SimState};
 use image::{RgbImage, Rgb};
 use std::convert::TryInto as _;
-use std::fmt::Write as _;
 use std::fs::File;
 use std::path::PathBuf;
 use y4m;
 
+// fn clamp(v: f32, range: f32) -> f32 {
+//     v.min(range).max(-range)
+// }
+
+// fn curl(x: f64, y: f64) -> f64 {
+//     let c = x * y;
+//     if c >= 0.0 {
+//         c.sqrt()
+//     } else {
+//         -(-c).sqrt()
+//     }
+// }
+
+fn norm_color(v: f64) -> u8 {
+    (v * 64.0 + 128.0).max(0.0).min(255.0) as u8
+}
+
 fn simstate_to_image(state: &SimState) -> RgbImage {
     let w = state.width().try_into().unwrap();
     let h = state.height().try_into().unwrap();
@@ -57,23 +73,6 @@ impl Renderer for NumericTermRenderer {
 
 pub struct ColorTermRenderer;
 
-fn clamp(v: f32, range: f32) -> f32 {
-    v.min(range).max(-range)
-}
-
-fn norm_color(v: f64) -> u8 {
-    (v * 64.0 + 128.0).max(0.0).min(255.0) as u8
-}
-
-fn curl(x: f64, y: f64) -> f64 {
-    let c = x * y;
-    if c >= 0.0 {
-        c.sqrt()
-    } else {
-        -(-c).sqrt()
-    }
-}
-
 impl Renderer for ColorTermRenderer {
     fn render(&mut self, state: &SimState) {
         let square = "█";