most methods written and passed tests

LoopFun.java

@@ -8,7 +8,13 @@ public class LoopFun
        * @return the factorial of the number
        */
       public int factorial(int number){
-          return -1;
+     
+    { 
+        if (number == 0) 
+          return 1; 
+          
+        return number*factorial(number-1); 
+    }
       }
 
       /**
@@ -19,6 +25,11 @@ public class LoopFun
        * @return Upper case string of the first letter of each word
        */
       public String acronym(String phrase) {
+         String newstring[] = phrase.split(" ");
+      
+         for (i=0;i<newstring.length;i++){
+             newstring[i].
+            }
           return null;
       }
 

MathUtilities.java

@@ -6,7 +6,7 @@ public class MathUtilities{
    * @return the sum of the two numbers
    */
   public int add(int num1, int num2){
-      return -1;
+      return (num1+num2);
   }
 
   /**
@@ -16,7 +16,7 @@ public class MathUtilities{
    * @return the sum of the two numbers
    */
   public double add(double num1, double num2){
-      return -1;
+      return (num1+num2);
   }
 
   /**
@@ -25,7 +25,7 @@ public class MathUtilities{
    * @return the half of the number in double
    */
   public double half(int number) {
-      return -1;
+      return (number/2);
   }
 
   /**
@@ -34,6 +34,7 @@ public class MathUtilities{
    * @return true if the number is odd, false if it is even
    */
   public boolean isOdd(int number){
+      if (number%2==0) return true;
       return false;
   }
 
@@ -44,7 +45,7 @@ public class MathUtilities{
    * @return the result of the number multiply by itself
    */
   public int square(int number) {
-      return -1;
+      return (number*number);
   }
 
 }

StringUtilities.java

@@ -1,13 +1,31 @@
 public class StringUtilities {
    public Character getMiddleCharacter(String word){
-       return null;
+       int position;
+       String middleChar;
+       position = (word.length()/2);
+       return (word.substring(position,position+1)).charAt(0);
    }
    
-   public String removeCharacter(String value, char charToRemove){
-     return null;  
-   }
+   public String removeCharacter(String value, char charToRemove){  
+     char[] chars=value.toCharArray();
+     String str="";
+     for(int i=0;i<chars.length;i++){
+         if (chars[i]==charToRemove) {
+             continue;}
+             else{
+                 str+=chars[i];
+                }
+            }
+return (str);
+}
+
+
+
+
    
    public String getLastWord(String value) {
-       return null;
+       
+       String strArr[] = value.split(" ");
+       return strArr[strArr.length-1];
    }
 }