Improve README for design patterns + initial refactoring

Author: mperor

DesignPatterns/README.md

@@ -4,4 +4,25 @@
 
 This project explores various design patterns and their implementations in modern Java. It aims to provide developers with practical examples and best practices for using design patterns to create robust and maintainable code.
 
-[Check it out 🔍](src/main/java/pl/mperor/lab/java/Dummy.java)
+## Design Pattern Catalog 📚
+
+### Behavioral Design Patterns 💪
+
+- [Strategy](src/main/java/pl/mperor/lab/java/design/pattern/behavioral/strategy) 🎯
+- [Execute Around Method (EAM)](src/main/java/com/example/eam) ⭕
+
+### Creational Design Patterns 🏭
+
+- [Factory](src/main/java/pl/mperor/lab/java/design/pattern/creational/factory) 🏭
+- [Builder](src/main/java/pl/mperor/lab/java/design/pattern/creational/builder) 🏗️
+- [Singleton](src/main/java/pl/mperor/lab/java/design/pattern/creational/singleton) 1️⃣
+
+### Structural Design Patterns 🎁
+
+- [Adapter](src/main/java/pl/mperor/lab/java/design/pattern/structural/adapter) 🔌
+- [Bridge](src/main/java/pl/mperor/lab/java/design/pattern/structural/bridge) 🌉
+- [Composite](src/main/java/pl/mperor/lab/java/design/pattern/structural/composite) 🌿
+- [Decorator](src/main/java/pl/mperor/lab/java/design/pattern/structural/decorator) 🎨
+- [Facade](src/main/java/pl/mperor/lab/java/design/pattern/structural/facade) 🏢
+- [Flyweight](src/main/java/pl/mperor/lab/java/design/pattern/structural/flyweight) 🪶
+- [Proxy](src/main/java/pl/mperor/lab/java/design/pattern/structural/proxy) 🛡️

DesignPatterns/src/main/java/pl/mperor/lab/java/design/pattern/behavioral/strategy/MathUtils.java

@@ -0,0 +1,26 @@
+package pl.mperor.lab.java.design.pattern.behavioral.strategy;
+
+import java.util.List;
+import java.util.function.Predicate;
+
+public class MathUtils {
+
+    public static int totalValue(List<Integer> values) {
+        return totalValue(values, _ -> true);
+    }
+
+    public static int totalValue(List<Integer> values, Predicate<Integer> selector) {
+        return values.stream()
+                .filter(selector)
+                .mapToInt(e -> e)
+                .sum();
+    }
+
+    public static boolean isEven(int number) {
+        return number % 2 == 0;
+    }
+
+    public static boolean isOdd(int number) {
+        return !isEven(number);
+    }
+}

DesignPatterns/src/test/java/pl/mperor/lab/java/design/pattern/behavioral/strategy/LightweightStrategyTest.java

@@ -4,34 +4,14 @@
 import org.junit.jupiter.api.Test;
 
 import java.util.List;
-import java.util.function.Predicate;
 
 public class LightweightStrategyTest {
 
     @Test
     public void testTotalValueStrategy() {
         var values = List.of(1, 2, 3, 4);
-        Assertions.assertEquals(10, totalValue(values));
-        Assertions.assertEquals(6, totalValue(values, LightweightStrategyTest::isEven));
-        Assertions.assertEquals(4, totalValue(values, LightweightStrategyTest::isOdd));
-    }
-
-    public static int totalValue(List<Integer> values) {
-        return totalValue(values, _ -> true);
-    }
-
-    public static int totalValue(List<Integer> values, Predicate<Integer> selector) {
-        return values.stream()
-                .filter(selector)
-                .mapToInt(e -> e)
-                .sum();
-    }
-
-    public static boolean isEven(int number) {
-        return number % 2 == 0;
-    }
-
-    public static boolean isOdd(int number) {
-        return !isEven(number);
+        Assertions.assertEquals(10, MathUtils.totalValue(values));
+        Assertions.assertEquals(6, MathUtils.totalValue(values, MathUtils::isEven));
+        Assertions.assertEquals(4, MathUtils.totalValue(values, MathUtils::isOdd));
     }
 }