Fix spacing after private constructor for Checkstyle

Author: rajucreate

src/main/java/com/thealgorithms/maths/DiscreteLogarithmBSGS.java

@@ -13,10 +13,15 @@
  * <p>
  * Time complexity: O(√m)
  * Space complexity: O(√m)
+ *
  * @see <a href="https://en.wikipedia.org/wiki/Baby-step_giant-step">Baby-step giant-step algorithm</a>
-*/
+ */
 public class DiscreteLogarithmBSGS {
 
+    private DiscreteLogarithmBSGS() {
+        throw new UnsupportedOperationException("Utility class");
+    }
+
     /**
      * Computes x such that (a^x) % m == b.
      * Returns -1 if no solution exists.