diff --git a/src/main/java/LoopFun.java b/src/main/java/LoopFun.java
index 801ab56..cb77820 100644
--- a/src/main/java/LoopFun.java
+++ b/src/main/java/LoopFun.java
@@ -1,4 +1,4 @@
- 
+import java.util.Arrays;
 
 public class LoopFun
 {
@@ -10,7 +10,14 @@ public class LoopFun
        * @return the factorial of the number
        */
       public Integer factorial(Integer number){
-          return null;
+          Integer factorialResult = 1;
+          for (int i = 1; i <= number; i++) {
+              factorialResult = factorialResult * i;
+          }
+          return   factorialResult;
+
+          //ternary operator would've worked too
+          //return (number ==1) || (number == 0) ? 1 : number * factorial(number -1);
       }
 
       /**
@@ -21,7 +28,23 @@ public Integer factorial(Integer number){
        * @return Upper case string of the first letter of each word
        */
       public String acronym(String phrase) {
-          return null;
+          StringBuilder acronym = new StringBuilder();
+          String input = phrase;
+          input = input.toUpperCase();
+          String[] phraseArray = input.split(" ");
+          for (int i = 0; i < phraseArray.length; i++) {
+              acronym.append(phraseArray[i].charAt(0));
+          }
+          String result = acronym.toString();
+          return result;
+
+          /*String [] sentence = phrase.split(" ");
+          String result = "";
+          for (String s : sentence) {
+          result = result + s.charAt(0);
+          }
+          return result.toUpperCase();
+           */
       }
 
       /**
@@ -37,6 +60,52 @@ public String acronym(String phrase) {
        * @return the encrypted string by shifting each character by three character
        */
       public String encrypt(String word) {
-          return null;
+          //this code doesn't check for letters, and can encrypt special characters...
+          //Not the best implementation, but now the method only accepts strings composed of letters. How it re-enters input
+          //would have to be considered where the method is called.
+          for (int j = 0; j < word.length(); j++) {
+              if (!Character.isLetter(word.charAt(j))) {
+                  return "Please only enter letters";
+              }
+          }
+          //The actual, used code. The numeric values of the letters weren't matching unicode... I've got to find java's numeric values.
+          char[] charArray = new char[word.length()];
+
+          for (int i = 0; i < word.length(); i++) {
+              int numberValueOfCurrentChar = java.lang.Character.getNumericValue(word.charAt(i));
+              if (numberValueOfCurrentChar >= 33) {
+                  int encryptedValue = (word.charAt(i) - 23);
+                  charArray[i] = (char) encryptedValue;
+              } else {
+                  int encryptedValue = (word.charAt(i) + 3);
+                  charArray[i] = (char) encryptedValue;
+              }
+          }
+              String encryptedWord = String.valueOf(charArray);
+              return encryptedWord;
+
+              //second attempt
+//          int[] valueOfChars = new int[word.length()];
+//          System.out.println(valueOfChars);
+//          for (int i = 0; i < word.length(); i++) {
+//              valueOfChars[i] = word.charAt(i) + 3;
+//          }
+//          System.out.println(valueOfChars);
+//          return null;
+
+              //first attempt -_-
+//          char[] lettersToChange = new char[word.length()];
+//          char currentLetter;
+//          for (int i = 0; i <word.length(); i++) {
+//              lettersToChange[i] = word.charAt(i);
+//          }
+//          for (int i = 0; i < word.length(); i++) {
+//              currentLetter = lettersToChange[i];
+//              currentLetter += 3;
+//              lettersToChange[i] = currentLetter;
+//          }
+//          String encryptedWord = lettersToChange.toString();
+//          return encryptedWord;
+          }
       }
-}
+
diff --git a/src/main/java/MathUtilities.java b/src/main/java/MathUtilities.java
index e067c75..cdbeeae 100644
--- a/src/main/java/MathUtilities.java
+++ b/src/main/java/MathUtilities.java
@@ -9,7 +9,7 @@ public class MathUtilities{
    * @return the sum of the two numbers
    */
   public Integer add(Integer baseValue, Integer valueToAdd){
-      return null;
+      return baseValue + valueToAdd;
   }
 
   /**
@@ -19,7 +19,7 @@ public Integer add(Integer baseValue, Integer valueToAdd){
    * @return the sum of the two numbers
    */
   public Double add(Double baseValue, Double valueToAdd){
-      return null;
+    return baseValue + valueToAdd;
   }
 
   /**
@@ -28,7 +28,7 @@ public Double add(Double baseValue, Double valueToAdd){
    * @return the half of the number in double
    */
   public Double half(Integer number) {
-      return null;
+      return (number / 2.0);
   }
 
   /**
@@ -37,7 +37,7 @@ public Double half(Integer number) {
    * @return true if the number is odd, false if it is even
    */
   public Boolean isOdd(Integer number){
-      return null;
+      return number % 2 != 0;
   }
 
 
@@ -47,7 +47,7 @@ public Boolean isOdd(Integer number){
    * @return the result of the number multiply by itself
    */
   public Integer square(Integer number) {
-      return null;
+      return number * number;
   }
 
 }
diff --git a/src/main/java/StringUtilities.java b/src/main/java/StringUtilities.java
index e3ea8a9..77075bc 100644
--- a/src/main/java/StringUtilities.java
+++ b/src/main/java/StringUtilities.java
@@ -5,7 +5,7 @@ public class StringUtilities {
      * @return `input`
      */
     public String returnInput(String input) {
-        return null;
+        return input;
     }
 
     /**
@@ -14,7 +14,8 @@ public String returnInput(String input) {
      * @return the concatenation of `baseValue` and `valueToBeAdded`
      */
     public String concatenate(String baseValue, String valueToBeAdded) {
-        return null;
+        String concatenatedString = baseValue + valueToBeAdded;
+        return concatenatedString;
     }
 
     /**
@@ -22,7 +23,14 @@ public String concatenate(String baseValue, String valueToBeAdded) {
      * @return identical string with characters in opposite order
      */
     public String reverse(String valueToBeReversed) {
-        return null;
+        StringBuilder reverser = new StringBuilder();
+        for (int i = valueToBeReversed.length() -1; i >= 0; i--) {
+            reverser.append(valueToBeReversed.charAt(i));
+        }
+        String result = reverser.toString();
+        return result;
+
+        // return new StringBuilder(valueToBeReversed).reverse().toString();  // a one line solution.
     }
 
     /**
@@ -30,7 +38,14 @@ public String reverse(String valueToBeReversed) {
      * @return middle character of `word`
      */
     public Character getMiddleCharacter(String word) {
-        return null;
+        if (word.length() % 2 == 0) {
+            throw new IllegalArgumentException("Word must contain odd number of letters");
+        }
+        int characterIndexToRetrieve = word.length() / 2;
+        Character result = word.charAt(characterIndexToRetrieve);
+        return result;
+
+        //return word.charAt(word.length()/2); // one line solution that does the same thing.
     }
 
     /**
@@ -39,7 +54,7 @@ public Character getMiddleCharacter(String word) {
      * @return `value` with char of value `charToRemove` removed
      */
     public String removeCharacter(String value, Character charToRemove) {
-        return null;
+        return value.replaceAll(charToRemove.toString(), "");
     }
 
     /**
@@ -47,6 +62,24 @@ public String removeCharacter(String value, Character charToRemove) {
      * @return last `word` in sentence
      */
     public String getLastWord(String sentence) {
-        return null;
+
+        //code directly below would extract all non letters and keep sentence structure w/ spaces. That way our last 'word' doesn't include punctuation.
+//       String updatedSentence = "";
+//       for (int i = 0; i < sentence.length(); i++) {
+//           if (Character.isLetter(sentence.charAt(i)) || Character.isSpaceChar(sentence.charAt(i))) {
+//               updatedSentence = updatedSentence + sentence.charAt((i));
+//           }
+//       }
+//        System.out.println(updatedSentence);
+        //this works but I don't like it. It meets the test cases, but still includes punctuation. may update method & test cases.
+        String[] input = sentence.split(" ");
+        return input[input.length -1];
+
+        //or
+        //ArrayList<String> inputSentence = new ArrayList<>(sentence.split(""));
+        //return inputSentence.get(inputSentence.size()-1;
+
+//        or
+        //could have also used a variable to spot the last space, store that index position. then use that with input.substring();
     }
 }
diff --git a/src/test/java/LoopFunEncryptTest.java b/src/test/java/LoopFunEncryptTest.java
index 492f1dd..29e8513 100644
--- a/src/test/java/LoopFunEncryptTest.java
+++ b/src/test/java/LoopFunEncryptTest.java
@@ -41,4 +41,17 @@ public void testEncryptWithTheLastLetters() {
         //Then
         assertEquals(expected, actual);
     }
+
+//    @Test
+//    public void testEncryptNoSpecialCharacters() {
+//        //Given
+//        String word = "quiz1!@#";
+//        String expected = "Please only enter letters";
+//
+//        //When
+//        String actual = loop.encrypt(word);
+//
+//        //Then
+//        assertEquals(expected, actual);
+//    }
 }
diff --git a/src/test/java/LoopsFunAcronymTest.java b/src/test/java/LoopsFunAcronymTest.java
index 61e2f5b..8ef11cb 100644
--- a/src/test/java/LoopsFunAcronymTest.java
+++ b/src/test/java/LoopsFunAcronymTest.java
@@ -51,6 +51,7 @@ public void test3() {
         assertEquals(expected, actual);
     }
 
+    @Test
     public void test6() {
         // given
         String phrase = "Center Disease Control Whistle Blower";
@@ -63,6 +64,7 @@ public void test6() {
         assertEquals(expected, actual);
     }
 
+    @Test
     public void test7() {
         // given
         String phrase = "Tuskegee Macon County, Alabama";
@@ -75,6 +77,7 @@ public void test7() {
         assertEquals(expected, actual);
     }
 
+    @Test
     public void test8() {
         // given
         String phrase = "John Charles Cutler";
@@ -100,6 +103,7 @@ public void test9() {
         assertEquals(expected, actual);
     }
 
+    @Test
     public void test4() {
         // given
         String phrase = "Tactical Reconnaissance Nuclear Powered Aerospace Platform";
diff --git a/src/test/java/StringUtilsGetLastWordTest.java b/src/test/java/StringUtilsGetLastWordTest.java
index e03d1f9..dcb4b00 100644
--- a/src/test/java/StringUtilsGetLastWordTest.java
+++ b/src/test/java/StringUtilsGetLastWordTest.java
@@ -40,7 +40,7 @@ public void test2(){
     }
 
     @Test
-    public void test4() {
+    public void test3() {
         // Given
         String sentence = "quantum information conservation";
         String expected = "conservation";
@@ -53,7 +53,7 @@ public void test4() {
     }
 
     @Test
-    public void test5() {
+    public void test4() {
         // Given
         String sentence = "The universe yields geometries so elegant, they animate with intelligence.";
         String expected = "intelligence.";
diff --git a/src/test/java/StringUtilsGetMiddleCharacterTest.java b/src/test/java/StringUtilsGetMiddleCharacterTest.java
index 5447b19..359ac78 100644
--- a/src/test/java/StringUtilsGetMiddleCharacterTest.java
+++ b/src/test/java/StringUtilsGetMiddleCharacterTest.java
@@ -66,4 +66,18 @@ public void test4(){
         //Then
         assertEquals(expected, actual);
     }
+
+    //I don't think I did the exception correctly.
+//    @Test(expected = Exception.class)
+//    public void testStringWithEvenNoOfCharacters() {
+//        //Given
+//        String word = "pooppoop";
+//        String expected = "Word must contain odd number of letters";
+//
+//        //When
+//        char actual = utilities.getMiddleCharacter(word);
+//        //Then
+//        assertEquals(expected, actual);
+//
+//    }
 }
diff --git a/src/test/java/TestSuite.java b/src/test/java/TestSuite.java
new file mode 100644
index 0000000..b0b6aa5
--- /dev/null
+++ b/src/test/java/TestSuite.java
@@ -0,0 +1,24 @@
+
+import org.junit.runner.RunWith;
+import org.junit.runners.Suite;
+
+@RunWith(Suite.class)
+
+@Suite.SuiteClasses({
+        LoopFunEncryptTest.class,
+        LoopFunFactorialTest.class,
+        LoopsFunAcronymTest.class,
+        MathUtilitiesAddTest.class,
+        MathUtilitiesHalfTest.class,
+        MathUtilitiesIsOddTest.class,
+        MathUtilitiesSquareTest.class,
+        StringUtilsConcatenateTest.class,
+        StringUtilsGetLastWordTest.class,
+        StringUtilsGetMiddleCharacterTest.class,
+        StringUtilsRemoveCharacterTest.class,
+        StringUtilsReturnInputTest.class,
+        StringUtilsReverseTest.class,
+})
+
+public class TestSuite {
+}