diff --git a/.DS_Store b/.DS_Store
new file mode 100644
index 0000000..d175190
Binary files /dev/null and b/.DS_Store differ
diff --git a/mock/.DS_Store b/mock/.DS_Store
new file mode 100644
index 0000000..f1b6cf8
Binary files /dev/null and b/mock/.DS_Store differ
diff --git a/mock/machine/.DS_Store b/mock/machine/.DS_Store
new file mode 100644
index 0000000..163f46a
Binary files /dev/null and b/mock/machine/.DS_Store differ
diff --git a/mock/machine/coding/.DS_Store b/mock/machine/coding/.DS_Store
new file mode 100644
index 0000000..be02aef
Binary files /dev/null and b/mock/machine/coding/.DS_Store differ
diff --git a/mock/machine/coding/pkg3/Board.java b/mock/machine/coding/pkg3/Board.java
new file mode 100644
index 0000000..8e6a88d
--- /dev/null
+++ b/mock/machine/coding/pkg3/Board.java
@@ -0,0 +1,96 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package mock.machine.coding.pkg3;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ *
+ * @author rajeshkumar.yadav
+ */
+public class Board extends Item{
+    
+    //Board: Each board should have a id, name, privacy (PUBLIC/PRIVATE), url, members, lists
+
+    private Privacy privacy;
+    private String url;
+    private List<User> userList;
+    private List<ListItem> list;
+
+    public Board(Privacy privacy, String name) {
+        
+        super(name);
+        this.privacy = privacy;
+        url = URLGenerator.getURL(getId());
+        userList = new ArrayList<>();
+        list = new ArrayList<>();
+    }
+
+    public Privacy getPrivacy() {
+        return privacy;
+    }
+
+    public String getUrl() {
+        return url;
+    }
+
+    public void setPrivacy(Privacy privacy) {
+        this.privacy = privacy;
+    }
+
+    public void setUrl(String url) {
+        this.url = url;
+    }
+    
+    public void addListItemToBoard(ListItem l){
+        list.add(l);
+        l.setBoard(this);
+    }
+    
+    public void removeListFromBoard(ListItem l){
+        if(list.contains(l))
+            list.remove(l);
+    }
+    
+    public void addUserToBoard(User u){
+        userList.add(u);
+    }
+    
+    public void removeUserToBoard(User u){
+        if(userList.contains(u))
+            userList.remove(u);
+    }
+    
+    public String getPrintableString(){
+        String s = "{ Id: " + getId() + ", Name:  " + getName() + " privacy: " + getPrivacy() + ", URL:  " + getUrl();
+        if(userList.size() > 0){
+            s = s + ", Users: [";
+            for(int i=0; i<userList.size(); i++){
+                s = s + userList.get(i).getPrintableString();
+                if(i<userList.size()-1)
+                    s = s+", ";
+            }
+            s = s + "]";
+        }
+        if(list.size() > 0){
+            s = s + ", List: [";
+            for(int i=0; i<list.size(); i++){
+                s = s + list.get(i).getPrintableString();
+                if(i<list.size()-1)
+                    s = s+", ";
+            }
+            s = s + "]";
+        }
+        s = s + " }";
+        return s;
+    }
+    
+    public void show(){
+        System.out.println(getPrintableString());
+    }
+
+}
diff --git a/mock/machine/coding/pkg3/Card.java b/mock/machine/coding/pkg3/Card.java
new file mode 100644
index 0000000..a571d8b
--- /dev/null
+++ b/mock/machine/coding/pkg3/Card.java
@@ -0,0 +1,62 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package mock.machine.coding.pkg3;
+
+/**
+ *
+ * @author rajeshkumar.yadav
+ */
+public class Card extends Item{
+    
+    //Card: Each card should have a id, name, description, assigned user
+    private String description;
+    private User assigendUser;
+    private ListItem litem;
+
+    public Card(String name) {
+        super(name);
+        //this.assigendUser = assigendUser;
+    }
+
+    public String getDescription() {
+        return description;
+    }
+
+    public void setDescription(String description) {
+        this.description = description;
+    }
+
+    public User getAssigendUser() {
+        return assigendUser;
+    }
+
+    public void setAssigendUser(User assigendUser) {
+        this.assigendUser = assigendUser;
+    }
+    
+    public void unAssigendUser() {
+        this.assigendUser = null;
+    }
+
+    public ListItem getLitem() {
+        return litem;
+    }
+
+    public void setLitem(ListItem litem) {
+        this.litem = litem;
+    }
+    
+    public String getPrintableString(){
+        String s = " { id: " + getId() + ", name: " + getName() + ", description:  " + getDescription() + ",  AssignedToUser: " + getAssigendUser().getName() + " }";
+        return s;
+    }
+    
+    public void show(){
+        System.out.println(getPrintableString());    
+    }
+    
+    
+}
diff --git a/mock/machine/coding/pkg3/IdCreator.java b/mock/machine/coding/pkg3/IdCreator.java
new file mode 100644
index 0000000..39a31ba
--- /dev/null
+++ b/mock/machine/coding/pkg3/IdCreator.java
@@ -0,0 +1,36 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package mock.machine.coding.pkg3;
+
+/**
+ *
+ * @author rajeshkumar.yadav
+ */
+public class IdCreator {
+    
+    private static int inc = 0;
+    private static IdCreator idCreator = null;
+    
+    private IdCreator(){
+        
+    }
+    
+    public static IdCreator getInstance(){
+        if(idCreator == null)
+            idCreator = new IdCreator();
+        return  idCreator;
+    }
+    
+    public static String getNewId(){
+        
+        String s = String.valueOf(System.currentTimeMillis()).substring(1,9);
+        inc = (inc + 1)%10;
+        s = s + inc;
+        return s;
+    }
+    
+    
+}
diff --git a/mock/machine/coding/pkg3/Item.java b/mock/machine/coding/pkg3/Item.java
new file mode 100644
index 0000000..25d4b74
--- /dev/null
+++ b/mock/machine/coding/pkg3/Item.java
@@ -0,0 +1,40 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package mock.machine.coding.pkg3;
+
+/**
+ *
+ * @author rajeshkumar.yadav
+ */
+public class Item {
+    
+    private String id;
+    private String name;
+
+    public Item(String name) {
+        this.id = IdCreator.getNewId();
+        this.name = name;
+    }
+
+    public String getId() {
+        return id;
+    }
+    
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+    
+    public void show(){
+        
+    }
+    public String getPrintableString(){
+        return "";
+    }
+}
diff --git a/mock/machine/coding/pkg3/ListItem.java b/mock/machine/coding/pkg3/ListItem.java
new file mode 100644
index 0000000..a61186a
--- /dev/null
+++ b/mock/machine/coding/pkg3/ListItem.java
@@ -0,0 +1,71 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package mock.machine.coding.pkg3;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ *
+ * @author rajeshkumar.yadav
+ */
+public class ListItem extends Item{
+    
+    // List: Each list should have a id, name and cards
+    private List<Card> cards;
+    private Board board;
+
+    public ListItem(String name) {
+        super(name);
+        cards = new ArrayList<>();
+    }
+
+    public List<Card> getCards() {
+        return cards;
+    }
+    
+    //We should also be able to move cards across lists in the same board
+    public void AddCardToList(Card c){
+        if(c.getLitem() != null && this.getBoard() != c.getLitem().getBoard())
+            return;
+        cards.add(c);
+        c.setLitem(this);
+    }
+    
+    // We should also be able to remove cards from lists 
+    public void removeCardFromList(Card c){
+        if(c.getLitem() != null)
+            return;
+        cards.remove(c);
+        c.setLitem(null);
+    }
+
+    public Board getBoard() {
+        return board;
+    }
+
+    public void setBoard(Board board) {
+        this.board = board;
+    }
+    
+    public String getPrintableString(){
+        String s = "{ Id: " + getId() + ", Name:  " + getName();
+        if(cards.size() > 0){
+            s = s + ", cards: [";
+            for(int i=0; i<cards.size(); i++){
+                s = s + cards.get(i).getPrintableString();
+                if(i<cards.size()-1)
+                    s = s+", ";
+            }
+        }
+        return s;
+    }
+    
+    public void show(){
+        System.out.println(getPrintableString());
+    }
+    
+}
diff --git a/mock/machine/coding/pkg3/MockMachineCoding3.java b/mock/machine/coding/pkg3/MockMachineCoding3.java
new file mode 100644
index 0000000..5c223a9
--- /dev/null
+++ b/mock/machine/coding/pkg3/MockMachineCoding3.java
@@ -0,0 +1,346 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package mock.machine.coding.pkg3;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+/**
+ *
+ * @author rajeshkumar.yadav
+
+
+
+SHOW
+SHOW BOARD
+SHOW LIST
+SHOW CARD
+* 
+ */
+public class MockMachineCoding3 {
+
+    Map<String, Board> boards;
+    Map<String, User> users;
+    Map<String, ListItem> lists;
+    Map<String, Card> cards;
+
+    public MockMachineCoding3() {
+        
+        boards = new HashMap<>();
+        users = new HashMap<>();
+        lists = new HashMap<>();
+        cards = new HashMap<>();
+        
+    }
+    
+    public Board getBoard(String id){
+        if(boards.get(id) == null){
+            System.out.println("Board Item does not exist");
+            return null;
+        }
+        return  boards.get(id);
+    }
+    
+    public ListItem getListItem(String id){
+        if(lists.get(id) == null){
+            System.out.println("List Item does not exist");
+            return null;
+        }
+        return  lists.get(id);
+    }
+    
+    public boolean isListPresent(String id){
+        
+        if(lists.get(id) == null){
+            System.out.println("List Item does not exist");
+            return false;
+        }
+        return  true;
+        
+    }
+    
+    public boolean isUserPresent(String id){
+        if(users.get(id) == null){
+            System.out.println("User does not exist");
+            return false;
+        }
+        return  true;
+    }
+    
+    public boolean isBoradPresent(String id){
+        if(boards.get(id) == null){
+            System.out.println("Board does not exist");
+            return false;
+        }
+        return  true;
+    }
+    
+    public boolean isCardPresent(String sysId){
+        if(cards.get(sysId) == null){
+            System.out.println("Card does not exist");
+            return false;
+        }
+        return true;
+    }
+    
+    /* BOARD CREATE */
+    public String createBoard(String name){
+        Board b = new Board(Privacy.privateType, name);
+        System.out.println("Board with ID " + b.getId()  + " has crated ");
+        boards.put(b.getId(), b);
+        return b.getId();
+    }
+    
+    /* BOARD <name/privacy> */
+    public void changeBoardAttribute(String id, String attributeName, String val){
+        
+        if(!isBoradPresent(id)){
+            return ;
+        }
+        Board b = boards.get(id);
+        
+        if(attributeName.equalsIgnoreCase("name")){
+            b.setName(val);
+        }else if(attributeName.equalsIgnoreCase("privacy")){
+            b.setPrivacy(Privacy.getPrivacy(val));
+        }
+        
+    }
+    
+    /* BOARD <ADD_MEMBER/REMOVE_MEMBER> */
+    public void addBoardMember(String boardId, String userId){
+        
+        if(!isBoradPresent(boardId)){
+            return ;
+        }
+        Board b = boards.get(boardId);
+        if(!isUserPresent(userId)){
+            return;
+        }
+        User u = users.get(userId);
+        b.addUserToBoard(u);
+    }
+    
+    /* BOARD <ADD_MEMBER/REMOVE_MEMBER> */
+    public void removeBoardMember(String boardId, String userId){
+        
+        if(!isBoradPresent(boardId)){
+            return ;
+        }
+        Board b = boards.get(boardId);
+        if(!isUserPresent(userId)){
+            return;
+        }
+        User u = users.get(userId);
+        b.removeUserToBoard(u);
+    }
+    
+    /* BOARD DELETE */
+    public void deleteBoard(String id){
+        if(!isBoradPresent(id))
+            return;
+        boards.remove(id);
+    }
+    
+    /* List CREATE */
+    public String createList(String boradId, String name){
+        
+        if(!isBoradPresent(boradId))
+            return "";
+        
+        ListItem l = new ListItem( name);
+        System.out.println("List with ID " + l.getId()  + " has crated ");
+        lists.put(l.getId(), l);
+        
+        Board b = boards.get(boradId);
+        b.addListItemToBoard(l);
+        return l.getId();
+        
+    }
+    
+    /* LIST DELETE */
+    public void deleteList(String id){
+        
+        if(!isListPresent(id))
+            return;
+        
+        Board b = lists.get(id).getBoard();
+        b.removeListFromBoard(lists.get(id));
+   
+    }
+    
+    
+    /* CARD CREATE */
+    public void createCard(String listId, String name){
+        
+        if(!isListPresent(listId))
+            return;
+        
+//        if(!isUserPresent(userId))
+//            return;
+//        
+//        User u = users.get(userId);
+        ListItem l = lists.get(listId);
+        
+        Card c = new Card(name);
+        //c.setAssigendUser(u);
+        System.out.println("Card with ID " + c.getId()  + " has crated ");
+        cards.put(c.getId(), c);
+        
+        l.AddCardToList(c);
+        c.setLitem(l);
+        
+        
+    }
+    
+    /* CARD <name/description> */
+    public void changeCardAttribute(String cardId, String attributeName, String val){
+        
+        if(!isBoradPresent(cardId)){
+            return ;
+        }
+        Card c = cards.get(cardId);
+        
+        if(attributeName.equalsIgnoreCase("name")){
+           c.setName(val);
+        }else if(attributeName.equalsIgnoreCase("description")){
+            c.setDescription(val);
+        }
+        
+    }
+    
+    /* CARD ASSIGN */
+    public void cardAssign(String cardId, String userId){
+        
+        if(!isCardPresent(cardId)){
+            return;
+        }
+        Card c = cards.get(cardId);
+        if(!isUserPresent(userId)){
+            return;
+        }
+        User u = users.get(userId);
+        c.setAssigendUser(u);
+    }
+    
+    /* CARD UNASSIGN */
+    public void cardUnAssign(String cardId){
+        
+        if(!isCardPresent(cardId)){
+            return;
+        }
+        Card c = cards.get(cardId);
+        c.unAssigendUser();
+        
+    }
+    
+    /* CARD MOVE */
+    public void cardMove(String cardId, String listId){
+        
+        if(!isCardPresent(cardId)){
+            return ;
+        }
+        Card c = cards.get(cardId);
+        if(!isListPresent(listId)){
+            return;
+        }
+        ListItem l = lists.get(listId);
+        l.AddCardToList(c);
+    }
+    
+    /* CARD DELETE */
+    public void deleteCard(String id){
+        if(!isCardPresent(id))
+            return;
+        Card c = cards.get(id);
+        ListItem l = c.getLitem();
+        l.removeCardFromList(c);
+        cards.remove(c);
+    }
+    
+    public void show(){
+        for(Board b : boards.values()){
+            b.show();
+        }
+    }
+    
+    public void show(Item item){
+        if(item != null)
+            item.show();
+    }
+    
+    public static void main(String[] args) {
+        
+        MockMachineCoding3 mmc3 = new MockMachineCoding3();
+        
+        User u1 = new User("Rajesh Yadav", "rky@gmail.com");
+        User u2 = new User("Suresh Prabhu", "srp@gmail.com");
+        User u3 = new User("SRK", "srk@gmail.com");
+        User u4 = new User("Rishabh", "rishi@gmail.com");
+        mmc3.users.put(u1.getUserId(), u1);
+        mmc3.users.put(u2.getUserId(), u2);
+        mmc3.users.put(u3.getUserId(), u3);
+        mmc3.users.put(u4.getUserId(), u4);
+        String id1, id;
+        mmc3.show();
+        id1 = mmc3.createBoard("work@tech");
+        mmc3.show(mmc3.getBoard(id1));
+        mmc3.show();
+        mmc3.changeBoardAttribute(id1, "name", "workat.tech");
+        mmc3.changeBoardAttribute(id1, "privacy", "privateType");
+        mmc3.show(mmc3.getBoard(id1));
+        
+        id = mmc3.createBoard("workat");
+        mmc3.show();
+        mmc3.addBoardMember(id, u1.getUserId());
+        mmc3.addBoardMember(id, u2.getUserId());
+        mmc3.addBoardMember(id, u3.getUserId());
+        //BOARD 5da1583ec25d2a7e246b0375 REMOVE_MEMBER user2
+        mmc3.removeBoardMember(id, u2.getUserId());
+        //SHOW BOARD 5da1583ec25d2a7e246b0375
+        mmc3.show(mmc3.getBoard(id));
+        //BOARD DELETE 5da1586caaaad00d9b2d7aa6
+        mmc3.deleteBoard(id);
+        //SHOW BOARD 5da1586caaaad00d9b2d7aa6
+        mmc3.show(mmc3.getBoard(id));
+        //SHOW
+        mmc3.show();
+        //LIST CREATE 5da1583ec25d2a7e246b0375 
+        String id2 = mmc3.createList(id1, "Mock Interviews");
+        mmc3.show(mmc3.getListItem(id2));
+        
+        /*
+
+
+
+
+
+
+SHOW LIST 5da1583547c78c15a1408df2
+LIST 5da1583547c78c15a1408df2 name Mock Interviews - Applied
+SHOW LIST 5da1583547c78c15a1408df2
+LIST CREATE 5da1583ec25d2a7e246b0375 Mock Interviews - Scheduled
+SHOW BOARD 5da1583ec25d2a7e246b0375
+CARD CREATE 5da1583547c78c15a1408df2 abcd@gmail.com
+CARD CREATE 5da1583547c78c15a1408df2 abcda@gmail.com
+SHOW LIST 5da1583547c78c15a1408df2
+CARD 5da1583547c78c15a14kj78g name abcde@gmail.com
+CARD 5da1583547c78c15a14kj78g description At 7PM
+SHOW LIST 5da1583547c78c15a1408df2
+CARD 5da1583547c78c15a14kjsd8 ASSIGN gaurav@workat.tech
+SHOW CARD 5da1583547c78c15a14kjsd8
+CARD 5da1583547c78c15a14kjsd8 MOVE 5da1583547c78c15a143hj34
+SHOW LIST 5da1583547c78c15a1408df2
+SHOW LIST 5da1583547c78c15a143hj34
+CARD 5da1583547c78c15a14kjsd8 UNASSIGN
+SHOW CARD 5da1583547c78c15a14kjsd8
+SHOW*/
+        
+    }
+    
+}
diff --git a/mock/machine/coding/pkg3/Privacy.java b/mock/machine/coding/pkg3/Privacy.java
new file mode 100644
index 0000000..eee9cc8
--- /dev/null
+++ b/mock/machine/coding/pkg3/Privacy.java
@@ -0,0 +1,24 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package mock.machine.coding.pkg3;
+
+/**
+ *
+ * @author rajeshkumar.yadav
+ */
+public enum Privacy {
+    
+    publicType, privateType;
+    
+    public static Privacy getPrivacy(String privacyType){
+        if(privacyType.equalsIgnoreCase("publicType"))
+            return Privacy.publicType;
+        else if(privacyType.equalsIgnoreCase("privateType"))
+            return  Privacy.privateType;
+        return Privacy.privateType;
+    }
+    
+}
diff --git a/mock/machine/coding/pkg3/URLGenerator.java b/mock/machine/coding/pkg3/URLGenerator.java
new file mode 100644
index 0000000..2afe36d
--- /dev/null
+++ b/mock/machine/coding/pkg3/URLGenerator.java
@@ -0,0 +1,20 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package mock.machine.coding.pkg3;
+
+/**
+ *
+ * @author rajeshkumar.yadav
+ */
+public class URLGenerator {
+    
+    //private static String domainName = trello";
+    
+    public static String getURL(String sysId){
+        return "www.trello." + sysId + ".com";
+    }
+    
+}
diff --git a/mock/machine/coding/pkg3/User.java b/mock/machine/coding/pkg3/User.java
new file mode 100644
index 0000000..3ee4c8e
--- /dev/null
+++ b/mock/machine/coding/pkg3/User.java
@@ -0,0 +1,55 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package mock.machine.coding.pkg3;
+
+/**
+ *
+ * @author rajeshkumar.yadav
+ */
+public class User {
+    
+    //User: Each user should have a userId, name, email.
+    
+    private String userId;
+    private String name;
+    private String email;
+
+    public User(String name, String email) {
+        this.name = name;
+        this.email = email;
+        userId = IdCreator.getNewId();
+    }
+
+    public String getUserId() {
+        return userId;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getEmail() {
+        return email;
+    }
+
+    public void setEmail(String email) {
+        this.email = email;
+    }
+    
+    public String getPrintableString(){
+        String s = " { id: " + getUserId() + ", name: " + getName() + ",  Email: " + getEmail() + " }";
+        return s;
+    }
+    
+    public void show(){
+        System.out.println(getPrintableString());
+    }
+
+}