Clippy fixes

src/controller.rs

@@ -52,17 +52,20 @@ impl PIController {
         initial_h: f64,
     ) -> Self {
         Self {
-            alpha: alpha,
-            beta: beta,
+            alpha,
+            beta,
             factor_c1: 1.0 / min_factor,
             factor_c2: 1.0 / max_factor,
             factor_old: 1.0e-4,
             h_max: h_max.abs(),
-            safety_factor: safety_factor,
+            safety_factor,
             old_h: initial_h,
         }
     }
-    pub fn default() -> Self {
+}
+
+impl Default for PIController {
+    fn default() -> Self {
         Self::new(0.17, 0.04, 10.0, 0.2, 100000.0, 0.9, 1e-4)
     }
 }