[init:] added initial Student-Importer

import.cs

@@ -0,0 +1,50 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+
+namespace spplus;
+
+public static class import
+{
+    public static List<Student> ImportStudentsFromFile(string path)
+    {
+        var dict = new Dictionary<string, (string Name, List<string> Courses)>();
+
+        foreach (var line in File.ReadLines(path).Skip(1)) // Header überspringen
+        {
+            if (string.IsNullOrWhiteSpace(line))
+                continue;
+
+            var parts = line.Split(',');
+            if (parts.Length < 3)
+                continue;
+
+            string nameWithId = parts[0].Trim();
+            string course = parts[2].Replace("(2)", "").Replace("(3)", "").Replace("(4)", "").Trim();
+
+            int open = nameWithId.LastIndexOf('(');
+            int close = nameWithId.LastIndexOf(')');
+            if (open < 0 || close < 0 || close <= open)
+                continue;
+
+            string name = nameWithId[..open].Trim();
+            string id = nameWithId[(open + 1)..close].Trim();
+
+            if (!dict.ContainsKey(id))
+                dict[id] = (name, new List<string>());
+
+            dict[id].Courses.Add(course);
+        }
+
+        var result = new List<Student>();
+
+        foreach (var (id, data) in dict)
+        {
+            var student = new Student(id, data.Name, data.Courses);
+            result.Add(student);
+        }
+
+        return result;
+    }
+}