introduce bitloops

src/main/java/puzzle/Main.java

@@ -114,7 +114,6 @@ public class Main {
          else rebuildIndex();
          info("indexUpdated : " + INDEX_FILE);
       } catch (IOException e) {
-         e.printStackTrace();
          err("Failed to write: " + FILE_NAME);
          err("Reason       : " + e.getMessage());
          System.exit(2);
@@ -345,7 +344,6 @@ public class Main {
       try {
          return _attempt(rng, dict, opts);
       } catch (Exception e) {
-         e.printStackTrace();
          System.err.println("Failed to operate" + e.getMessage());
          return null;
       }
@@ -445,7 +443,6 @@ public class Main {
          Files.writeString(indexPath, content, StandardCharsets.UTF_8);
          info("indexUpdated : " + indexPath);
       } catch (IOException e) {
-         e.printStackTrace();
          err("Failed to update index.json: " + e.getMessage());
       }
    }
@@ -486,12 +483,10 @@ public class Main {
                      var pathInIndex = "/puzzles/" + filename;
                      records.add(toIndexRecordJson(id, pathInIndex, date, theme, difficulty, createdAt));
                   } catch (IOException e) {
-                     e.printStackTrace();
                      err("Failed to read " + path + ": " + e.getMessage());
                   }
                });
       } catch (IOException e) {
-         e.printStackTrace();
          err("Failed to list puzzles: " + e.getMessage());
          return;
       }
@@ -502,7 +497,6 @@ public class Main {
          Files.writeString(indexPath, content, StandardCharsets.UTF_8);
          info("Successfully rebuilt index.json with " + records.size() + " records.");
       } catch (IOException e) {
-         e.printStackTrace();
          err("Failed to write index.json: " + e.getMessage());
       }
    }