Fixed Checkstyle issues in PowerOfFour.java

Author: Mansi5164

src/test/java/com/thealgorithms/bitmanipulation/PowerOfFour.java

@@ -0,0 +1,16 @@
+package com.thealgorithms.bitmanipulation;
+
+public class PowerOfFour {
+
+    private PowerOfFour() {
+        throw new IllegalStateException("Utility class");
+    }
+
+    public static boolean isPowerOfFour(int n) {
+        if (n <= 0) {
+            return false;
+        } else {
+            return (n & (n - 1)) == 0 && (n & 0x55555555) != 0;
+        }
+    }
+}