solves determine if string halves are alike

Author: anishLearnsToCode

Diff for: README.md

@@ -418,7 +418,7 @@
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 | 1694 | [Reformat Phone Number](https://leetcode.com/problems/reformat-phone-number)                                                                              |                                                               [![Java](assets/java.png)](src/ReformatPhoneNumber.java)                                                               |                                                                                                                                   |
 | 1700 | [Number of Students Unable to Eat Lunch](https://leetcode.com/problems/number-of-students-unable-to-eat-lunch)                                            |                                                        [![Java](assets/java.png)](src/NumberOfStudentsUnableToEatLunch.java)                                                         |                                                                                                                                   |
-| 1704 | [Determine if String Halves Are Alike](https://leetcode.com/problems/determine-if-string-halves-are-alike)                                                |                                                                                                                                                                                      |                                                                                                                                   |
+| 1704 | [Determine if String Halves Are Alike](https://leetcode.com/problems/determine-if-string-halves-are-alike)                                                |                                                         [![Java](assets/java.png)](src/DetermineIfStringHalvesAreAlike.java)                                                         |                                                                                                                                   |
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Diff for: src/DetermineIfStringHalvesAreAlike.java

@@ -0,0 +1,23 @@
+import java.util.Set;
+
+public class DetermineIfStringHalvesAreAlike {
+    private static final Set<Character> VOWELS = Set.of('a', 'e', 'i', 'o', 'u', 'A', 'E', 'I', 'O', 'U');
+
+    public boolean halvesAreAlike(String s) {
+        return numberOfVowels(s, 0, s.length() / 2) == numberOfVowels(s, s.length() / 2);
+    }
+
+    private int numberOfVowels(String s, int startIndex) {
+        return numberOfVowels(s, startIndex, s.length());
+    }
+
+    private int numberOfVowels(String s, int startIndex, int endIndex) {
+        int count = 0;
+        for (int index = startIndex ; index < endIndex ; index++) {
+            if (VOWELS.contains(s.charAt(index))) {
+                count++;
+            }
+        }
+        return count;
+    }
+}