refactor: Add CNL message parsing logic to BodyParser

The code changes in `aviation_parser.go` and `aviation_parser_test.go` add CNL message parsing logic to the `BodyParser` module. This allows for the correct extraction and parsing of CNL messages, including the category, aircraft ID, departure airport, and destination airport. This enhancement improves the overall functionality and accuracy of the code.

internal/parsers/aviation_parser_test.go

@@ -213,6 +213,21 @@ NNNN`
 			})
 		})
 
+		Context("with CNL body", func() {
+			// parser := NewBodyParser()
+			It("should parse the body correctly", func() {
+				body := "(CNL-YZR7979-ZSPD-ZBTJ)"
+				parser := NewBodyParser(body)
+				category, parsedBody, err := parser.Parse()
+				Expect(err).ToNot(HaveOccurred())
+				Expect(parsedBody).ToNot(BeNil())
+				Expect(category).To(Equal("CNL"))
+				Expect(parsedBody).To(BeAssignableToTypeOf(&domain.CNL{}))
+				cnlMessage := parsedBody.(*domain.CNL)
+				Expect(cnlMessage.AircraftID).To(Equal("YZR7979"))
+			})
+		})
+
 	})
 
 	Describe("Parse whole real message", func() {