Update TortoiseHareAlgo.java

Fixed line formatting build error

Author: TejasSingh022

src/main/java/com/thealgorithms/datastructures/lists/TortoiseHareAlgo.java

@@ -31,7 +31,7 @@ public void append(E value) {
     }
 
     public E getMiddle() {
-        if (head == null){
+        if (head == null) {
             return null;
         }