fixed 3b solution

src/Problem3b.java

@@ -15,7 +15,7 @@ public class Problem3b {
                 String maxDigits = maxKDigitsString(line, 12);
                 total += Long.parseLong(maxDigits);
             }
-            System.out.println("Total maximum joltage: " + total);
+            System.out.println(total);
         } catch (IOException e) {
             e.printStackTrace();
         }