Remove the need for the bike parts to be Copy

src/main.rs

 #![doc = include_str!("../README.md")]
 
-#[derive(Debug, Clone, Copy)]
+#[derive(Debug)]
 pub enum Brake {
     Disk,
     Pads,
 }
 
-#[derive(Debug, Clone, Copy)]
+#[derive(Debug)]
 pub enum Wheel {
     Large,
     Small,
 }
 
-#[derive(Debug, Clone, Copy)]
+#[derive(Debug)]
 pub enum Transmission {
     Standard,
     GearHub,
@@ -63,8 +63,8 @@ impl BikeBuilder {
     /// Builds the bike from the builder.
     ///
     /// Will return an error is the bike builder misses parts
-    pub fn build(self) -> Result<Bike, String> {
-        match (self.wheels, self.transmission, self.brakes) {
+    pub fn build(mut self) -> Result<Bike, String> {
+        match (self.wheels.take(), self.transmission.take(), self.brakes.take()) {
             (Some(w), Some(t), Some(b)) => Ok(Bike {
                 wheels: w,
                 transmission: t,