Adding automatic IP address, some refactor and better texts. Upgrading version.

src/coords.rs

@@ -0,0 +1,48 @@
+pub struct Coordinates {
+    pub latitude: f64,
+    pub longitude: f64,
+}
+
+impl Coordinates {
+    pub fn new(latitude: f64, longitude: f64) -> Coordinates {
+        Coordinates {
+            latitude,
+            longitude,
+        }
+    }
+
+    pub fn is_correct_latitude(&self) -> bool {
+        return self.latitude > -90.0 && self.latitude < 90.0;
+    }
+
+    pub fn is_correct_longitude(&self) -> bool {
+        return self.longitude > -180.0 && self.longitude < 180.0;
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn valid_coords() {
+        let coords = Coordinates {
+            latitude: -20.0,
+            longitude: 15.0,
+        };
+
+        assert!(coords.is_correct_latitude());
+        assert!(coords.is_correct_longitude());
+    }
+
+    #[test]
+    fn invalid_coords() {
+        let coords = Coordinates {
+            latitude: -95.0,
+            longitude: 185.0,
+        };
+
+        assert!(!coords.is_correct_latitude());
+        assert!(!coords.is_correct_longitude());
+    }
+}