refactor: integrate StudentCsvParser into FileDataSource

app/src/main/java/ru/project/datasource/FileDataSource.java

@@ -0,0 +1,39 @@
+package ru.project.datasource;
+
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.stream.Collector;
+import ru.project.student.Student;
+import ru.project.collection.MyList;
+import ru.project.collection.MyLinkedList;
+
+public class FileDataSource implements DataSource{
+    private final String fileName;
+
+    public FileDataSource(String fileName) {
+        this.fileName = fileName;
+    }
+
+    @Override
+    public MyList<Student> create() {
+        MyList<Student> resultList = new MyLinkedList<>();
+        try {
+            StudentCsvReader reader = new StudentCsvReader(fileName);
+            while reader.hasNext() {
+                result.append(reader.next());
+            }
+        }
+        catch (IllegalArgumentException e){
+            System.out.println(e.getMessage());
+            return null;
+        }
+        catch (NoSuchElementException e){
+            System.out.println("No such element");
+            return null;
+        }
+    }
+}