Fix issue eclipse#288 - added implementation of duplicatesAndUnique m…

…ethod and test case for the same

Added implementations of duplicatesAndUnique method in haiku-kata-solutions

Updated duplicatesAndUnique method

Updated with a different approach to get duplicate chars and unique chars from MutableCharBag

haiku-kata-solutions/src/main/java/org/eclipse/collections/haikukata/TextProcessorEC.java

@@ -59,18 +59,17 @@ public String distinctLetters()
 
     public Triple<CharBag, CharBag, CharSet> duplicatesAndUnique()
     {
-        // TODO: Find all of the alphabetic letters from this.getHaikuAsCharAdapter(), convert them to lowercase
-        // and store them in a MutableCharBag.
-        // Hint: Look at select, collectChar, and toBag
-        MutableCharBag chars = null;
-
-        // TODO: Find all the chars with duplicates
-        // Hint: Find a method on MutableCharBag that returns duplicates
-        CharBag duplicates = null;
-
-        // TODO: Find all the unique chars
-        // Hint: Find a method on MutableCharBag that returns unique chars
-        CharSet unique = null;
+        // Find all of the alphabetic letters, convert them to lowercase
+        MutableCharBag chars = this.getHaikuAsCharAdapter()
+                                .select(Character::isAlphabetic)
+                                .collectChar(Character::toLowerCase)
+                                .toBag();
+
+        // Find all the chars with duplicates
+        CharBag duplicates = chars.selectDuplicates();
+
+        // Find all the unique chars
+        CharSet unique = chars.selectUnique();
 
         return Tuples.triple(chars, duplicates, unique);
     }

haiku-kata-solutions/src/test/java/org/eclipse/collections/haikukata/TextProcessorECTest.java

@@ -47,8 +47,8 @@ public void distinctLetters()
         Assertions.assertEquals("breakingthoupvmwcdflsy", distinctLetters);
     }
 
-//    @Test // Uncomment once duplicatesAndUnique is implemented for EC
-//    @Tag("SOLUTION")
+    @Test
+    @Tag("SOLUTION")
     public void duplicatesAndUnique()
     {
         Triple<CharBag, CharBag, CharSet> triple = new TextProcessorEC().duplicatesAndUnique();