feat: implement type to record internal solution

integration/oasis/solution/doc.go

@@ -0,0 +1,7 @@
+/*
+package solution defines internal foramt for recording single solution result.
+It isolates internal calculation logic and final restful response:
+- Internal algorithm will calculate result in this format.
+- In the end, oasis will use this format to generate restful response.
+*/
+package solution

integration/oasis/solution/solution.go

@@ -0,0 +1,26 @@
+package solution
+
+// Solution contains summary and selected charge stations
+type Solution struct {
+	Distance       float64
+	Duration       float64
+	RemainingRage  float64
+	Weight         float64
+	ChargeStations []*ChargeStation
+}
+
+// ChargeStation contains all information related with specific charge station
+type ChargeStation struct {
+	Location      Location
+	StationID     string
+	ArrivalEnergy float64
+	WaitTime      float64
+	ChargeTime    float64
+	ChargeRange   float64
+}
+
+// Location defines the geo location of a station
+type Location struct {
+	Lat float64
+	Lon float64
+}