Add Power of Four Check using bit manipulation (#7065)

* Add Power of Four Check using bit manipulation

- Implements isPowerOfFour method using bit manipulation
- Checks if number is power of two and has bit at even position
- Includes comprehensive unit tests
- Fixes #6940

* Fix code formatting in PowerOfFourTest

* Move PowerOfFour classes to maths package

* Fix package declaration in PowerOfFourTest

* Fix code formatting in PowerOfFourTest

* Remove redundant import from PowerOfFourTest

* Remove unrelated file

src/test/java/com/thealgorithms/maths/PowerOfFourTest.java

@@ -0,0 +1,36 @@
+package com.thealgorithms.maths;
+
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import org.junit.jupiter.api.Test;
+
+class PowerOfFourTest {
+
+    @Test
+    void testPowersOfFour() {
+        assertTrue(PowerOfFour.isPowerOfFour(1));
+        assertTrue(PowerOfFour.isPowerOfFour(4));
+        assertTrue(PowerOfFour.isPowerOfFour(16));
+        assertTrue(PowerOfFour.isPowerOfFour(64));
+        assertTrue(PowerOfFour.isPowerOfFour(256));
+        assertTrue(PowerOfFour.isPowerOfFour(1024));
+    }
+
+    @Test
+    void testNonPowersOfFour() {
+        assertFalse(PowerOfFour.isPowerOfFour(2));
+        assertFalse(PowerOfFour.isPowerOfFour(3));
+        assertFalse(PowerOfFour.isPowerOfFour(5));
+        assertFalse(PowerOfFour.isPowerOfFour(8));
+        assertFalse(PowerOfFour.isPowerOfFour(15));
+        assertFalse(PowerOfFour.isPowerOfFour(32));
+    }
+
+    @Test
+    void testEdgeCases() {
+        assertFalse(PowerOfFour.isPowerOfFour(0));
+        assertFalse(PowerOfFour.isPowerOfFour(-1));
+        assertFalse(PowerOfFour.isPowerOfFour(-4));
+    }
+}