another commit

src/main/java/rocks/zipcode/quiz5/fundamentals/Calculator.java

@@ -10,7 +10,8 @@ public class Calculator {
     }
 
     public static Double square(Double value) {
-        return Math.pow(value ,value);
+
+        return value * value;
     }
 
     public static Double[] squareRoots(Double... value) {

src/main/java/rocks/zipcode/quiz5/fundamentals/StringUtils.java

@@ -32,16 +32,27 @@ public class StringUtils {
     }
 
     public static Boolean hasDuplicateConsecutiveCharacters(String str) {
-        for (int i = 0; i <str.length() ; i++) {
+        String [] arr = str.split("");
+        for (int i = 0; i <arr.length-1; i++) {
+            for (int j = i+ 1; j <arr.length; j++) {
+                if (arr[i] == arr[j]){
+                    return true;
+                }
+
+            }
 
         }
 
 
 
-        return null;
+        return false;
     }
 
     public static String removeConsecutiveDuplicateCharacters(String str) {
+
+
+
+
         return null;
     }
 

src/main/java/rocks/zipcode/quiz5/objectorientation/account/BankAccount.java

@@ -12,13 +12,18 @@ public class BankAccount  extends Account implements Transactable {
 
 
     @Override
-    public void deposit(Double amountToIncreaseBy) {
+    public void deposit(Double amountToIncreaseBy) throws  IllegalArgumentException{
+        if(amountToIncreaseBy>0)
        valance = valance + amountToIncreaseBy;
     }
 
     @Override
-    public void withdrawal(Double amountToDecreaseBy) {
-    valance= valance - (amountToDecreaseBy);
+    public void withdrawal(Double amountToDecreaseBy)throws IllegalArgumentException  {
+        // if(valance > amountToDecreaseBy)
+       valance = valance - amountToDecreaseBy;
+
+
+
     }
 
     @Override