Remove serde (#23)

haversine/src/haversine.rs

@@ -1,6 +1,5 @@
-use serde::Serialize;
+use std::fmt::{Debug, Formatter};
 
-#[derive(Serialize)]
 pub struct CoordinatePair {
     pub x0: f64,
     pub y0: f64,
@@ -8,7 +7,22 @@ pub struct CoordinatePair {
     pub y1: f64,
 }
 
-#[derive(Serialize)]
+impl Debug for CoordinatePair {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        f.write_fmt(format_args!(
+            "x0: {} ({:?}), y0: {} ({:?}), x1: {} ({:?}), y1: {} ({:?})",
+            self.x0,
+            self.x0.to_be_bytes(),
+            self.y0,
+            self.y0.to_be_bytes(),
+            self.x1,
+            self.x1.to_be_bytes(),
+            self.y1,
+            self.y1.to_be_bytes()
+        ))
+    }
+}
+
 pub struct HaversineData {
     pub pairs: Vec<CoordinatePair>,
 }