Completed the quiz and all of the test passed

LoopFun.java

@@ -8,7 +8,11 @@ public class LoopFun
        * @return the factorial of the number
        */
       public int factorial(int number){
-          return -1;
+          int total = 1;
+          for(int i = number; i > 0; i--){
+            total = i * total;
+          }
+          return total;
       }
 
       /**
@@ -19,7 +23,21 @@ public class LoopFun
        * @return Upper case string of the first letter of each word
        */
       public String acronym(String phrase) {
-          return null;
+          StringBuilder finalString = new StringBuilder();
+          //ALWAYS TAKES FIRST LETTER
+          finalString.append(phrase.charAt(0));
+          for(int i = 0; i < phrase.length(); i++){
+          //CHECKS IF THERES A SPACE
+              if(phrase.charAt(i) == ' ') {  
+                //IF THERE IS IT ADD IT TO OUR STRING
+                i++;
+                finalString.append(phrase.charAt(i));
+            }
+          }
+          //TURNS STRINGBUILDER INTO STRING
+          String answer = "" + finalString;
+          //MAKES STRING ALL CAPITALS
+          return answer.toUpperCase();
       }
 
       /**
@@ -35,6 +53,19 @@ public class LoopFun
        * @return the encrypted string by shifting each character by three character
        */
       public String encrypt(String word) {
-          return null;
+          String newString = "";
+          for(int i = 0; i < word.length(); i++){
+              char encrypted = word.charAt(i);
+              int number = (int) encrypted;
+              if(number <= 119){
+              char newChar = (char)(number + 3);
+              newString = newString + newChar;
+              } else if(number >= 118){
+              char newChar = (char)(number - 23);
+              newString = newString + newChar;
+              }
+            }
+            System.out.println((char) 97);
+          return newString;
       }
 }

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 (double)number/2;
   }
 
   /**
@@ -34,7 +34,13 @@ public class MathUtilities{
    * @return true if the number is odd, false if it is even
    */
   public boolean isOdd(int number){
-      return false;
+      boolean answer = true;
+      if(number % 2 == 0){
+          answer = false;
+      }else if(number % 2 != 0){
+          answer = true;
+        }
+        return answer;
   }
 
 
@@ -44,7 +50,7 @@ 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 +1,25 @@
 public class StringUtilities {
    public Character getMiddleCharacter(String word){
-       return null;
+       //FIND LENGTH
+       int wordLength = word.length();
+       //FIND MIDDLE INDEX NUMBER
+       int wordHalf = wordLength / 2;
+       char wordMiddleLetter = word.charAt(wordHalf);
+       //GET THAT CHARAT THAT INDEX NUMBER
+       return wordMiddleLetter;
    }
    
    public String removeCharacter(String value, char charToRemove){
-     return null;  
+       //INDEX OF charToRemove
+       String a = "" + charToRemove;
+       value = value.replace(a,"");
+       return value;
    }
    
    public String getLastWord(String value) {
-       return null;
+       //MAKE SUBSTRINGS OF EACH WORD
+       int space = value.lastIndexOf(" ");
+       String LastWord = value.substring(space + 1, value.length());
+       return LastWord;
    }
 }