diff --git a/src/main/java/com/zipcodewilmington/assessment2/part1/BasicUtilities.java b/src/main/java/com/zipcodewilmington/assessment2/part1/BasicUtilities.java
index 1402353..7ce09f9 100644
--- a/src/main/java/com/zipcodewilmington/assessment2/part1/BasicUtilities.java
+++ b/src/main/java/com/zipcodewilmington/assessment2/part1/BasicUtilities.java
@@ -2,18 +2,18 @@
 
 public class BasicUtilities {
     public Boolean isGreaterThan5(Integer value) {
-        return null;
+        return value >= 5;
     }
 
     public Boolean isLessThan7(Integer value) {
-        return null;
+        return value <= 7;
     }
 
     public Boolean isBetween5And7(Integer valueToEvaluate) {
-        return null;
+        return valueToEvaluate >= 5 && valueToEvaluate <= 7;
     }
 
     public Boolean startsWith(String string, Character character) {
-        return null;
+        return string.charAt(0) == Character.toUpperCase(character) || string.charAt(0) == Character.toLowerCase(character);
     }
 }
diff --git a/src/main/java/com/zipcodewilmington/assessment2/part1/IntegerArrayUtilities.java b/src/main/java/com/zipcodewilmington/assessment2/part1/IntegerArrayUtilities.java
index a360000..3ff6d57 100644
--- a/src/main/java/com/zipcodewilmington/assessment2/part1/IntegerArrayUtilities.java
+++ b/src/main/java/com/zipcodewilmington/assessment2/part1/IntegerArrayUtilities.java
@@ -1,19 +1,28 @@
 package com.zipcodewilmington.assessment2.part1;
 
 public class IntegerArrayUtilities {
+
     public Boolean hasEvenLength(Integer[] array) {
-        return null;
+        return array.length % 2 == 0;
     }
 
     public Integer[] range(int start, int stop) {
-        return null;
+        Integer[] ranger = new Integer[stop - start + 1];
+        int index = 0;
+        for (int i = stop; i >= start; i--) {
+            ranger[index] = i;
+            index++;
+        }
+
+        return ranger;
     }
 
     public Integer getSumOfFirstTwo(Integer[] array) {
-        return null;
+        return array[0] + array[1];
     }
 
     public Integer getProductOfFirstTwo(Integer[] array) {
-        return null;
+        return array[array.length-1] * array[array.length-2];
     }
+
 }
diff --git a/src/main/java/com/zipcodewilmington/assessment2/part1/WuTangConcatenator.java b/src/main/java/com/zipcodewilmington/assessment2/part1/WuTangConcatenator.java
index 63f210e..2b0893f 100644
--- a/src/main/java/com/zipcodewilmington/assessment2/part1/WuTangConcatenator.java
+++ b/src/main/java/com/zipcodewilmington/assessment2/part1/WuTangConcatenator.java
@@ -1,18 +1,22 @@
 package com.zipcodewilmington.assessment2.part1;
 
 public class WuTangConcatenator {
+
+    Integer input;
+
     public WuTangConcatenator(Integer input) {
+        this.input = input;
     }
 
     public Boolean isWu() {
-        return null;
+        return input % 3 == 0;
     }
 
     public Boolean isTang() {
-        return null;
+        return input % 5 == 0;
     }
 
     public Boolean isWuTang() {
-        return null;
+        return input % 5 == 0 && input % 3 == 0;
     }
 }
diff --git a/src/main/java/com/zipcodewilmington/assessment2/part2/ArrayUtility.java b/src/main/java/com/zipcodewilmington/assessment2/part2/ArrayUtility.java
index de2f799..f6100dd 100644
--- a/src/main/java/com/zipcodewilmington/assessment2/part2/ArrayUtility.java
+++ b/src/main/java/com/zipcodewilmington/assessment2/part2/ArrayUtility.java
@@ -1,19 +1,100 @@
 package com.zipcodewilmington.assessment2.part2;
 
+import java.util.Map;
+import java.util.TreeMap;
+
 public class ArrayUtility {
     public Integer[] merge(Integer[] array1, Integer[] array2) {
-        return null;
+
+        Integer[] merge = new Integer[array1.length + array2.length];
+
+        for (int i = 0; i < array1.length ; i++) {
+            merge[i] = array1[i];
+        }
+        for (int i = 0; i < array2.length ; i++) {
+            merge[i + array1.length] = array2[i];
+        }
+
+        return merge;
     }
 
     public Integer[] rotate(Integer[] array, Integer index) {
-        return null;
+
+        Integer[] shifter = new Integer[array.length];
+
+        for (int i = 0; i < array.length; i++) {
+            if(i-index < 0){
+                shifter[array.length-index + i] = array[i];
+            } else {
+                shifter[i-index] = array[i];
+            }
+        }
+
+        return shifter;
     }
 
     public Integer countOccurrence(Integer[] array1, Integer[] array2, Integer valueToEvaluate) {
-        return null;
+        int counter = 0;
+
+        for(Integer i : array1){
+            if(i == valueToEvaluate){
+                counter++;
+            }
+        }
+        for(Integer i : array2){
+            if(i == valueToEvaluate){
+                counter++;
+            }
+        }
+
+        return counter;
     }
 
     public Integer mostCommon(Integer[] array) {
-        return null;
+
+        Map<Integer, Integer> mostMap = new TreeMap<>();
+        int nullCount = 0;
+
+        for (int i = 0; i < array.length; i++) {
+            if(array[i] != null){
+                Integer count = mostMap.get(array[i]);
+                if(count == null) {
+                    mostMap.put(array[i], 1);
+                } else {
+                    mostMap.put(array[i], count++);
+                }
+            }
+            else {
+                nullCount++;
+            }
+
+        }
+
+        Integer maxKey = null;
+        int maxValue = 0;
+
+        for(Map.Entry<Integer, Integer> e : mostMap.entrySet()){
+            if(e.getValue() >= maxValue){
+                maxKey = e.getKey();
+                maxValue = e.getValue();
+            }
+        }
+        if(nullCount > maxValue){
+            return null;
+        }
+
+        return maxKey;
     }
 }
+
+
+
+
+
+
+
+
+
+
+
+
diff --git a/src/main/java/com/zipcodewilmington/assessment2/part2/ListUtility.java b/src/main/java/com/zipcodewilmington/assessment2/part2/ListUtility.java
index e978685..f9b780e 100644
--- a/src/main/java/com/zipcodewilmington/assessment2/part2/ListUtility.java
+++ b/src/main/java/com/zipcodewilmington/assessment2/part2/ListUtility.java
@@ -1,29 +1,58 @@
 package com.zipcodewilmington.assessment2.part2;
 
+import java.util.ArrayList;
 import java.util.List;
+import java.util.stream.Collectors;
 
 public class ListUtility {
-    public Boolean add(int i) {
-        return null;
+
+    List<Integer> list = new ArrayList<>();
+
+    public Boolean add(Integer i) {
+
+        if(i == null){
+            list.add(null);
+        }
+
+        list.add(i);
+        return this.list.contains(i);
+
     }
 
     public Integer size() {
-        return null;
+        return list.size();
     }
 
     public List<Integer> getUnique() {
-        return null;
+
+        List<Integer> newList = new ArrayList<>();
+
+        // Streams only distinct values by using Object :: equals method
+        newList = list.stream().distinct().collect(Collectors.toList());
+
+        return newList;
     }
 
     public String join() {
-        return null;
+        String str = "";
+        for(int i = 0; i < list.size() - 1; i++){
+            str = str + list.get(i) + ", ";
+        }
+        str = str + list.get(list.size() - 1);
+
+        return str;
     }
 
+
+
     public Integer mostCommon() {
-        return null;
+        ArrayUtility arrayUtility = new ArrayUtility();
+        Integer[] array = new Integer[list.size()];
+        array = list.toArray(array);
+        return arrayUtility.mostCommon(array);
     }
 
     public Boolean contains(Integer valueToAdd) {
-        return null;
+        return list.contains(valueToAdd);
     }
 }
diff --git a/src/main/java/com/zipcodewilmington/assessment2/part2/Router.java b/src/main/java/com/zipcodewilmington/assessment2/part2/Router.java
index 2267425..75cf289 100644
--- a/src/main/java/com/zipcodewilmington/assessment2/part2/Router.java
+++ b/src/main/java/com/zipcodewilmington/assessment2/part2/Router.java
@@ -1,20 +1,38 @@
 package com.zipcodewilmington.assessment2.part2;
 
+import java.util.LinkedHashMap;
+import java.util.Map;
+
 public class Router {
+
+    Map<String, String> map = new LinkedHashMap<>();
+    StringBuilder str = new StringBuilder();
+
     public void add(String path, String controller) {
+        map.put(path, controller);
+        str.append(path);
+        str.append(controller);
+        str.append('\n');
     }
 
     public Integer size() {
-        return null;
+        return map.size();
     }
 
     public String getController(String path) {
-        return null;
+        return map.get(path);
     }
 
     public void update(String path, String studentController) {
+        add(path, studentController);
     }
 
     public void remove(String path) {
+        map.put(path, null);
+    }
+
+    @Override
+    public String toString() {
+        return str.toString();
     }
 }
diff --git a/src/main/java/com/zipcodewilmington/assessment2/part3/Bird.java b/src/main/java/com/zipcodewilmington/assessment2/part3/Bird.java
index ee230c5..33c199e 100644
--- a/src/main/java/com/zipcodewilmington/assessment2/part3/Bird.java
+++ b/src/main/java/com/zipcodewilmington/assessment2/part3/Bird.java
@@ -1,7 +1,17 @@
 package com.zipcodewilmington.assessment2.part3;
 
-public class Bird {
+public abstract class Bird implements Animal {
     public String move() {
+        return "fly";
+    }
+
+    @Override
+    public int getSpeed() {
+        return 0;
+    }
+
+    @Override
+    public String color() {
         return null;
     }
 
diff --git a/src/main/java/com/zipcodewilmington/assessment2/part3/BlueJay.java b/src/main/java/com/zipcodewilmington/assessment2/part3/BlueJay.java
index f18d13a..7c3f20e 100644
--- a/src/main/java/com/zipcodewilmington/assessment2/part3/BlueJay.java
+++ b/src/main/java/com/zipcodewilmington/assessment2/part3/BlueJay.java
@@ -1,4 +1,18 @@
 package com.zipcodewilmington.assessment2.part3;
 
-public class BlueJay {
+public class BlueJay extends Bird implements Animal {
+    @Override
+    public String move() {
+        return "fly";
+    }
+
+    @Override
+    public int getSpeed() {
+        return 13;
+    }
+
+    @Override
+    public String color() {
+        return "blue";
+    }
 }
diff --git a/src/main/java/com/zipcodewilmington/assessment2/part3/Horse.java b/src/main/java/com/zipcodewilmington/assessment2/part3/Horse.java
index e78cf2b..e033c1c 100644
--- a/src/main/java/com/zipcodewilmington/assessment2/part3/Horse.java
+++ b/src/main/java/com/zipcodewilmington/assessment2/part3/Horse.java
@@ -1,4 +1,18 @@
 package com.zipcodewilmington.assessment2.part3;
 
-public class Horse{
+public class Horse implements Animal{
+    @Override
+    public String move() {
+        return "gallop";
+    }
+
+    @Override
+    public int getSpeed() {
+        return 40;
+    }
+
+    @Override
+    public String color() {
+        return "brown";
+    }
 }
diff --git a/src/main/java/com/zipcodewilmington/assessment2/part3/RedRobin.java b/src/main/java/com/zipcodewilmington/assessment2/part3/RedRobin.java
index c1e85f2..171b589 100644
--- a/src/main/java/com/zipcodewilmington/assessment2/part3/RedRobin.java
+++ b/src/main/java/com/zipcodewilmington/assessment2/part3/RedRobin.java
@@ -1,4 +1,30 @@
 package com.zipcodewilmington.assessment2.part3;
 
-public class RedRobin {
+public class RedRobin extends Bird implements Animal{
+    String migrationMonth;
+
+    @Override
+    public String getMigrationMonth() {
+        return migrationMonth;
+    }
+
+    @Override
+    public void setMigrationMonth(String migrationMonth) {
+        this.migrationMonth = migrationMonth;
+    }
+
+    @Override
+    public String move() {
+        return "fly";
+    }
+
+    @Override
+    public int getSpeed() {
+        return 10;
+    }
+
+    @Override
+    public String color() {
+        return "red";
+    }
 }
diff --git a/src/main/java/com/zipcodewilmington/assessment2/part3/SpeedComparator.java b/src/main/java/com/zipcodewilmington/assessment2/part3/SpeedComparator.java
index 532e766..a798358 100644
--- a/src/main/java/com/zipcodewilmington/assessment2/part3/SpeedComparator.java
+++ b/src/main/java/com/zipcodewilmington/assessment2/part3/SpeedComparator.java
@@ -1,4 +1,12 @@
 package com.zipcodewilmington.assessment2.part3;
 
-public class SpeedComparator {
+import java.util.Comparator;
+
+public class SpeedComparator implements Comparator<Animal> {
+
+    @Override
+    public int compare(Animal o1, Animal o2) {
+        return o2.getSpeed() - o1.getSpeed();
+    }
+
 }
diff --git a/src/test/java/com/zipcodewilmington/assessment2/part2/router/ToStringTest.java b/src/test/java/com/zipcodewilmington/assessment2/part2/router/ToStringTest.java
index b199783..7d9e8e7 100644
--- a/src/test/java/com/zipcodewilmington/assessment2/part2/router/ToStringTest.java
+++ b/src/test/java/com/zipcodewilmington/assessment2/part2/router/ToStringTest.java
@@ -36,8 +36,9 @@ public void test4() {
                 new Pair<>("/instructors", "InstructorController"));
     }
 
-    @Test
-    public void test(Pair<String, String>... pairs) {
+
+
+    private void test(Pair<String, String>... pairs) {
         // given
         StringBuilder expectedString = new StringBuilder();
         Router router = new Router();