Added Ones & Twos Complement

Author: Monk-AbhinayVerma

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

@@ -9,6 +9,9 @@
  * @return the complimented binary string
  */
 public class OnesComplement {
+    private OnesComplement() {
+    }
+
     // Function to get the 1's complement of a binary number
     public static String onesComplement(String binary) {
         StringBuilder complement = new StringBuilder();

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

@@ -7,6 +7,9 @@
  * @return the two's complement of any binary number
  */
 public class TwosComplement {
+    private TwosComplement() {
+    }
+
     // Function to get the 2's complement of a binary number
     public static String twosComplement(String binary) {
         StringBuilder onesComplement = new StringBuilder();