chore: sync-up catalog (#682)

* chore: sync-up catalog

- kata/counting-characters (beta => 8-kyu)
- kata/spacify (7-kyu => retired)
- kata/days-in-the-year (8-kyu => retired)
- kata/center-of-array (beta => retired)

* docs: sync progress

* refactor: limit class visibility to package-private

Author: ParanoidUser

docs/README.md

@@ -1,7 +1,7 @@
 # Codewars Handbook ☕️🚀
 
 [![Views statistics +1 👀](https://img.shields.io/badge/dynamic/xml?color=success&label=views&query=//*[name()=%27text%27][3]&url=https://hits.seeyoufarm.com/api/count/incr/badge.svg?url=https%3A%2F%2Fgithub.com%2FParanoidUser%2Fcodewars-handbook)](https://hits.seeyoufarm.com/api/count/graph/dailyhits.svg?url=https://github.com/ParanoidUser/codewars-handbook)
-[![Completed kata 👌](https://img.shields.io/badge/completed%20kata-69.1%25-red.svg)](https://www.codewars.com/kata/search/java?xids=completed)
+[![Completed kata 👌](https://img.shields.io/badge/completed%20kata-68.9%25-red.svg)](https://www.codewars.com/kata/search/java?xids=completed)
 [![CI pipeline 🛠](https://img.shields.io/github/actions/workflow/status/ParanoidUser/codewars-handbook/build.yml?branch=main)](https://github.com/ParanoidUser/codewars-handbook/actions/workflows/build.yml)
 [![Quality gate 🔎](https://img.shields.io/sonar/alert_status/codewars-handbook?server=https%3A%2F%2Fsonarcloud.io)](https://sonarcloud.io/dashboard?id=codewars-handbook)
 [![Let's have a chat! 📞](https://img.shields.io/gitter/room/ParanoidUser/codewars-handbook?color=49c39e)](https://gitter.im/ParanoidUser/codewars-handbook)
@@ -25,7 +25,7 @@ slug.
 
 | [1 kyu](/kata/1-kyu/index.md) | [2 kyu](/kata/2-kyu/index.md) | [3 kyu](/kata/3-kyu/index.md) | [4 kyu](/kata/4-kyu/index.md) | [5 kyu](/kata/5-kyu/index.md) | [6 kyu](/kata/6-kyu/index.md) | [7 kyu](/kata/7-kyu/index.md) | [8 kyu](/kata/8-kyu/index.md) | [beta](/kata/beta/index.md) | [retired](/kata/retired/index.md) |
 |:-----------------------------:|:-----------------------------:|:-----------------------------:|:-----------------------------:|:-----------------------------:|:-----------------------------:|:-----------------------------:|:-----------------------------:|:---------------------------:|:---------------------------------:|
-| 0 | 1 | 2 | 26 | 48 | 433 | 591 | 219 | 56 | 79 |
+| 0 | 1 | 2 | 26 | 48 | 433 | 590 | 219 | 54 | 82 |
 
 **Note:** The source code is written in Java 17 and may use language features that are incompatible
 with Java 8, 11.

kata/6-kyu/code-breaking-by-letter-frequency/test/SampleTest.java

@@ -1,4 +1,4 @@
-public class Guesser {
+class Guesser {
   private int guesses = 0;
   private Integer num;
 
@@ -33,9 +33,9 @@ final void setAnswer(int answer) {
   }
 
   @SuppressWarnings("serial")
-  public static class GameException extends RuntimeException {
+  static class GameException extends RuntimeException {
     public GameException(String msg) {
       super(msg);
     }
   }
-}
+}

kata/6-kyu/guess-the-number-1/main/Guesser.java

@@ -1,7 +1,7 @@
 import java.util.HashSet;
 import java.util.Set;
 
-public class PhotoManager {
+class PhotoManager {
   private final Set<String> names = new HashSet<>();
 
   boolean nameExists(String name) {

kata/6-kyu/image-host-filename-generator/main/PhotoManager.java

@@ -8,7 +8,7 @@ static String revRot(String strng, int sz) {
     for (var i = 0; i <= strng.length() - sz; i += sz) {
       var chunk = new StringBuilder(strng.substring(i, sz + i));
       if (range(0, sz).mapToDouble(j -> Math.pow(chunk.charAt(j) - 48., 3)).sum() % 2 > 0) {
-        result.append(chunk.substring(1, sz)).append(chunk.charAt(0));
+        result.append(chunk, 1, sz).append(chunk.charAt(0));
       } else {
         result.append(chunk.reverse());
       }

kata/6-kyu/reverse-or-rotate/main/RevRot.java

@@ -7,7 +7,7 @@ class Student {
   private final String department;
   private final Gender gender;
 
-  public enum Gender {
+  enum Gender {
     MALE, FEMALE
   }
 }

kata/6-kyu/some-fun-with-aggregate-operations-part-4/main/Student.java

@@ -1,3 +1,2 @@
-public class InvalidPlugboardWiresException extends Exception
-{
-}
+class InvalidPlugboardWiresException extends Exception {
+}

kata/6-kyu/the-enigma-machine-part-1-the-plugboard/main/InvalidPlugboardWiresException.java

@@ -1,7 +1,7 @@
-public final class SimpleInteger implements Comparable<SimpleInteger> {
+final class SimpleInteger implements Comparable<SimpleInteger> {
   private final int value;
 
-  public SimpleInteger(int val) {
+  SimpleInteger(int val) {
     value = val;
   }
 
@@ -37,4 +37,4 @@ public boolean equals(Object obj) {
   public int hashCode() {
     return value ^ ((value + 1) * 31) * 31;
   }
-}
+}

kata/7-kyu/finding-remainder-without-using-percent-operator/main/SimpleInteger.java

@@ -1,4 +1,4 @@
-public final class ThreadUtil {
+final class ThreadUtil {
 
   private ThreadUtil() {}
 
@@ -12,4 +12,4 @@ static void method1() {
   static void method2() {
     id2 = Thread.currentThread().getId();
   }
-}
+}

kata/7-kyu/fixme-run-runner/main/ThreadUtil.java

@@ -1,8 +1,8 @@
 import lombok.AllArgsConstructor;
 
 @AllArgsConstructor
-public class Vector3D {
+class Vector3D {
   final double x;
   final double y;
   final double z;
-}
+}