Add find non repeating number algorithm (#4328)

src/main/java/com/thealgorithms/bitmanipulation/NonRepeatingNumberFinder.java

@@ -0,0 +1,17 @@
+package com.thealgorithms.bitmanipulation;
+
+/**
+ * Find Non Repeating Number
+ * @author Bama Charan Chhandogi (https://github.com/BamaCharanChhandogi)
+ */
+
+public class NonRepeatingNumberFinder {
+
+    public static int findNonRepeatingNumber(int[] arr) {
+        int result = 0;
+        for (int num : arr) {
+            result ^= num;
+        }
+        return result;
+    }
+}