```text

refactor: Add schedule_parser.go and schedule_parser_test.go

The code changes introduce a new `schedule_parser.go` file and its corresponding test file `schedule_parser_test.go`. These files contain the implementation and tests for the `FindWaypoints` function, which extracts waypoints from a given message. This addition enhances the functionality of the code by providing a way to parse and retrieve specific information from messages.

internal/parsers/schedule_parser.go

@@ -0,0 +1,31 @@
+package parsers
+
+import "regexp"
+
+const (
+	// DepartureCode   = "dep"
+	// DepartureTime   = "dep_time"
+	// ArrivalCode     = "arr"
+	AirportCode     = "airport"
+	WaypointPattern = `(?P<arr_time>\d{4}(\(\d{2}\w{3}\))?)(?P<airport>\w{3})\/?(?P<dep_time>\d{4}(\(\d{2}\w{3}\))?)`
+)
+
+var (
+	WaypointExpression = regexp.MustCompile(WaypointPattern)
+)
+
+func FindWaypoints(message string) map[string]string {
+	matches := WaypointExpression.FindStringSubmatch(message)
+	if matches == nil {
+		return nil
+	}
+
+	result := make(map[string]string)
+	for i, name := range WaypointExpression.SubexpNames() {
+		if i != 0 && name != "" {
+			result[name] = matches[i]
+		}
+	}
+
+	return result
+}

internal/parsers/schedule_parser_test.go

@@ -0,0 +1,26 @@
+package parsers
+
+import (
+	. "github.com/onsi/ginkgo/v2"
+	. "github.com/onsi/gomega"
+)
+
+var _ = Describe("Schedule Parser", func() {
+
+	Describe("FindWaypoints", func() {
+		It("should return the correct waypoints based on the message", func() {
+			message := "1845(11JUN)TSN/2100"
+			waypoints := FindWaypoints(message)
+			Expect(waypoints).NotTo(BeNil())
+			Expect(waypoints[ArrivalTime]).To(Equal("1845(11JUN)"))
+			Expect(waypoints[AirportCode]).To(Equal("TSN"))
+			Expect(waypoints[DepartureTime]).To(Equal("2100"))
+		})
+
+		It("should return nil if no waypoints are found", func() {
+			message := "1845TSN"
+			waypoints := FindWaypoints(message)
+			Expect(waypoints).To(BeNil())
+		})
+	})
+})