cosmetic changes

spec/geo_bearing_spec.cr

@@ -4,6 +4,10 @@ describe Geo::Bearing do
   lat1, lng1 = {48.8566, 2.3522}   # Paris
   lat2, lng2 = {40.7128, -74.0060} # New York
 
+  context "version" do
+    it { Geo::Bearing::VERSION.should be_a(String) }
+  end
+
   context "bearing" do
     # Checked on https://www.movable-type.co.uk/scripts/latlong.html
     context "calculates initial bearing" do

src/geo_bearing.cr

@@ -2,12 +2,14 @@ module Geo
   module Bearing
     VERSION = {{ `shards version #{__DIR__}`.chomp.stringify }}
 
+    extend self
+
     # The formula used for calculating the initial bearing between two points on the Earth's surfaceis
     # is derived from the broader concepts of great-circle distance and navigation on a spherical Earth model.
     # https://en.wikipedia.org/wiki/Great-circle_distance
     #
     # https://github.com/Turfjs/turf/blob/master/packages/turf-bearing/index.ts
-    def self.bearing(from_lat : Number, from_lng : Number, to_lat : Number, to_lng : Number, final = false) : Float64
+    def bearing(from_lat : Number, from_lng : Number, to_lat : Number, to_lng : Number, final = false) : Float64
       if final
         # Calculate the bearing from the destination point back to the original point
         reverse_bearing = calculate_bearing(to_lat, to_lng, from_lat, from_lng)
@@ -19,7 +21,7 @@ module Geo
       end
     end
 
-    private def self.calculate_bearing(lat1, lng1, lat2, lng2) : Float64
+    private def calculate_bearing(lat1, lng1, lat2, lng2) : Float64
       rad_lat1 = degrees_to_radians(lat1)
       rad_lng1 = degrees_to_radians(lng1)
       rad_lat2 = degrees_to_radians(lat2)
@@ -34,11 +36,11 @@ module Geo
       radians_to_degrees(Math.atan2(a, b)) % 360
     end
 
-    def self.degrees_to_radians(degrees : Number) : Float64
+    def degrees_to_radians(degrees : Number) : Float64
       degrees * Math::PI / 180.0
     end
 
-    def self.radians_to_degrees(radians : Number) : Float64
+    def radians_to_degrees(radians : Number) : Float64
       radians * 180.0 / Math::PI
     end
   end