Replace symlinks with duplicate classes (#2888)

This is try get around a possible compilation problem on Windows (see also https://forum.exercism.org/t/compilation-failure-in-calculator-conundrum-exercis/14254/5.)

exercises/concept/calculator-conundrum/.meta/config.json

@@ -4,6 +4,7 @@
     "jmrunkle"
   ],
   "contributors": [
+    "jagdish-15",
     "sanderploegsma"
   ],
   "files": {

exercises/concept/calculator-conundrum/.meta/src/reference/java/IllegalOperationException.java

@@ -0,0 +1,9 @@
+public class IllegalOperationException extends RuntimeException {
+    public IllegalOperationException(String errorMessage) {
+        super(errorMessage);
+    }
+
+    public IllegalOperationException(String errorMessage, Throwable cause) {
+        super(errorMessage, cause);
+    }
+}

exercises/concept/wizards-and-warriors-2/.meta/config.json

@@ -3,6 +3,7 @@
     "sougat818"
   ],
   "contributors": [
+    "jagdish-15",
     "sanderploegsma"
   ],
   "files": {

exercises/concept/wizards-and-warriors-2/.meta/src/reference/java/Character.java

@@ -0,0 +1,29 @@
+public class Character {
+    private String characterClass;
+    private int level;
+    private int hitPoints;
+
+    public String getCharacterClass() {
+        return characterClass;
+    }
+
+    public void setCharacterClass(String characterClass) {
+        this.characterClass = characterClass;
+    }
+
+    public int getLevel() {
+        return level;
+    }
+
+    public void setLevel(int level) {
+        this.level = level;
+    }
+
+    public int getHitPoints() {
+        return hitPoints;
+    }
+
+    public void setHitPoints(int hitPoints) {
+        this.hitPoints = hitPoints;
+    }
+}

exercises/concept/wizards-and-warriors-2/.meta/src/reference/java/Destination.java

@@ -0,0 +1,20 @@
+public class Destination {
+    private String name;
+    private int inhabitants;
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public int getInhabitants() {
+        return inhabitants;
+    }
+
+    public void setInhabitants(int inhabitants) {
+        this.inhabitants = inhabitants;
+    }
+}

exercises/concept/wizards-and-warriors-2/.meta/src/reference/java/TravelMethod.java

@@ -0,0 +1,4 @@
+public enum TravelMethod {
+    WALKING,
+    HORSEBACK
+}