updates

src/main/java/com/zipcodewilmington/danny_do_better_exercises/StringUtilities.java

      */
     public static String concatenation(int firstSegment, String secondSegment){
 
-        return firstSegment + "  " + secondSegment;
+        return firstSegment + secondSegment;
     }
 
     /**
      */
     public static String getPrefix(String input){
 
-        return input.substring(0,2);
+        return input.substring(0,3);
     }
 
     /**
      * @return the equivalence of two strings, `inputValue` and `comparableValue`
      */
     public static Boolean compareTwoStrings(String inputValue, String comparableValue){
+
         return inputValue.equals(comparableValue);
     }
 
      */
     public static Character getMiddleCharacter(String inputValue){
 
-        return 'A';
+        double mid = inputValue.length() / 2;
+        int full = (int)mid;
+
+            if (inputValue.length() % 2 != 0){
+                return inputValue.charAt(full);
+
+                } else {
+
+                return inputValue.charAt(full - 1);
+                  }
     }
 
     /**
      * @return the first sequence of characters
      */
     public static String getFirstWord(String spaceDelimitedString){
+            String list[] = spaceDelimitedString.split(" ", 2);
+
+                return list[0];
 
-        return spaceDelimitedString.split(" ")[0];
     }
 
     /**
      */
     public static String getSecondWord(String spaceDelimitedString){
 
-        return spaceDelimitedString.split(" ")[1];
+        String list[] = spaceDelimitedString.split(" ", 2);
+
+        return list[1];
     }
 
     /**
      * @return an identical string with characters in reverse order.
      */
     public static String reverseTheTwo(String stringToReverse){
-        return null;
+
+        String flip = "";
+
+        for(int i = stringToReverse.length()-1; i >= 0; i--){
+            flip += stringToReverse.charAt(i);
+            }
+
+            return flip;
     }
 }

src/test/java/com/zipcodewilmington/danny_do_better_exercises/TestStringUtilities.java

     public void substringBeginTest(){
         // : Given
         String input = "Hello";
-        String expected = "olleH";
+        String expected = "Hel";
 
         // : When
         String actual = StringUtilities.getPrefix(input);