fix: change location of others to correct places (#5559)

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

@@ -0,0 +1,17 @@
+package com.thealgorithms.bitmanipulation;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import org.junit.jupiter.api.Test;
+
+public class CountSetBitsTest {
+
+    @Test
+    void testSetBits() {
+        CountSetBits csb = new CountSetBits();
+        assertEquals(1L, csb.countSetBits(16));
+        assertEquals(4, csb.countSetBits(15));
+        assertEquals(5, csb.countSetBits(10000));
+        assertEquals(5, csb.countSetBits(31));
+    }
+}