🚧: var 24 done, needs testing

src/methods.cs

@@ -2,6 +2,33 @@ namespace struct_lab_student {
 	public partial class Program {
 		static void Var9(List<Student> students) { }
 		static void Var10(List<Student> students) { }
-		static void Var24(List<Student> students) { }
-    }
+		static void Var24(List<Student> students) {
+			var summer_kids = FilterSummerKids(students);
+			foreach (var (dude, avg) in summer_kids.Zip(EvalAverages(summer_kids)))
+				Console.WriteLine($"{dude.surName} {dude.firstName} {avg:0.0}");
+		}
+
+		public static IEnumerable<Student> FilterSummerKids(List<Student> students) {
+			return students.Where(student => {
+				if (DateTime.TryParseExact(student.dateOfBirth, "dd.MM.yyyy", null, System.Globalization.DateTimeStyles.None,
+					out DateTime date)
+					){
+					return date.Month >= 6 && date.Month <= 8;
+				}
+				return false;
+			});
+		}
+
+		public static List<double> EvalAverages(IEnumerable<Student>? students) {
+			List<double> averages = [];
+			if (students != null) {
+				foreach (var dude in students) {
+					int sum = 0;
+					for (int i = 0; i < 3; i++) sum += (dude.Marks[i] == '-') ? 2 : dude.Marks[i] - '0';
+					averages.Add(sum / 3.0);
+				}	
+			}
+			return averages;
+		}
+	}
 }