feat(6-kyu): kata/simple-rot13-dot-5-cypher (#503)

docs/README.md

@@ -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 | 44 | 419 | 561 | 206 | 55 | 79 |
+| 0 | 1 | 2 | 26 | 44 | 420 | 561 | 206 | 55 | 79 |
 
 **Note:** The source code is written in Java 17 and may use language features that are incompatible
 with Java 8, 11.

kata/6-kyu/index.md

@@ -333,6 +333,7 @@
 - [Simple nearest prime](simple-nearest-prime)
 - [Simple prime streaming](simple-prime-streaming)
 - [Simple reversed parenthesis](simple-reversed-parenthesis)
+- [Simple ROT13.5 cypher](simple-rot13-dot-5-cypher)
 - [Simple square numbers](simple-square-numbers)
 - [Simple string indices](simple-string-indices)
 - [Simple time difference](simple-time-difference)

kata/6-kyu/simple-rot13-dot-5-cypher/README.md

@@ -0,0 +1,18 @@
+# [Simple ROT13.5 cypher](https://www.codewars.com/kata/simple-rot13-dot-5-cypher "https://www.codewars.com/kata/5894986e2ddc8f6805000036")
+
+You are asked to write a simple cypher that rotates every character (in range [a-zA-Z], special chars will be ignored by
+the cypher) by 13 chars. As an addition to the original ROT13 cypher, this cypher will also cypher numerical
+digits ([0-9]) with 5 chars.
+
+Example:
+
+    "The quick brown fox jumps over the 2 lazy dogs"
+
+will be cyphered to:
+
+    "Gur dhvpx oebja sbk whzcf bire gur 7 ynml qbtf"
+
+Your task is to write a ROT13.5 (ROT135) method that accepts a string and encrypts it.
+Decrypting is performed by using the same method, but by passing the encrypted string again.
+
+Note: when an empty string is passed, the result is also empty.

kata/6-kyu/simple-rot13-dot-5-cypher/main/Kata.java

@@ -0,0 +1,10 @@
+import static java.util.stream.Collectors.joining;
+
+interface Kata {
+  static String ROT135(String input) {
+    return input.chars().mapToObj(c -> "" + (char) c).map(s -> "" + (char) (s.charAt(0) + (
+            s.matches("(?i)[A-M]") ? 13 : s.matches("(?i)[N-Z]") ? -13 :
+            s.matches("[0-4]") ? 5 : s.matches("[5-9]") ? -5 : 0)))
+        .collect(joining());
+  }
+}

kata/6-kyu/simple-rot13-dot-5-cypher/test/SolutionTest.java

@@ -0,0 +1,11 @@
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import org.junit.jupiter.api.Test;
+
+class SolutionTest {
+  @Test
+  void sample() {
+    assertEquals("Gur dhvpx oebja sbk whzcf bire gur 7 ynml qbtf", Kata.ROT135("The quick brown fox jumps over the 2 lazy dogs"));
+    assertEquals("The quick brown fox jumps over the 2 lazy dogs", Kata.ROT135("Gur dhvpx oebja sbk whzcf bire gur 7 ynml qbtf"));
+  }
+}