feat: implement composite pattern for student search

app/src/main/java/ru/project/search/StudentSearchService.java

@@ -0,0 +1,30 @@
+package ru.project.search;
+
+import ru.project.list.MyList;
+import ru.project.list.MyLinkedList;
+import ru.project.student.Student;
+
+public class StudentSearchService {
+    private final StudentSearchCriteria criteria;
+
+    public StudentSearchService(StudentSearchCriteria criteria) {
+        if (criteria == null) {
+            throw new IllegalArgumentException("Criteria must not be null");
+        }
+        this.criteria = criteria;
+    }
+
+    public MyList<Student> find(MyList<Student> students) {
+        if (students == null) {
+            return new MyLinkedList<>();
+        }
+        MyList<Student> result = new MyLinkedList<>();
+        for (int i = 0; i < students.size(); i++) {
+            Student s = students.get(i);
+            if (criteria.matches(s)) {
+                result.add(s);
+            }
+        }
+        return result;
+    }
+}