added method to create acronym

LoopFun.java

@@ -24,7 +24,17 @@ public class LoopFun
        * @return Upper case string of the first letter of each word
        */
       public String acronym(String phrase) {
-          return null;
+          int firstSpaceIndex = phrase.indexOf(" ");
+          int lastSpaceIndex = phrase.lastIndexOf(" ");
+          phrase = phrase.toUpperCase();
+          String result = phrase.substring(0,1);
+          while (lastSpaceIndex > firstSpaceIndex && firstSpaceIndex != -1) {
+              result = result + phrase.substring(firstSpaceIndex+1, firstSpaceIndex+2);
+              phrase = phrase.substring(0,firstSpaceIndex) + phrase.substring(firstSpaceIndex+1);
+              firstSpaceIndex = phrase.indexOf(" ");
+              System.out.print(result);
+            }
+          return result;
       }
 
       /**