feat: kata/i-before-e-except-after-c

kata/7-kyu/i-before-e-except-after-c/README.md

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+# [I before E except after C](https://www.codewars.com/kata/i-before-e-except-after-c "https://www.codewars.com/kata/6834f1a80e0a48c2ea3feeb0")
+
+## Intro
+
+There's a common mnemonic given to those learning English spelling which goes:
+
+> I before E except after C
+
+This suggests that when you have the letters `i` and `e` next to each other in a word, the `i` should come first, with the exception that if
+preceding the two vowels is the letter `c` in which case the `e` should go first.
+
+For example, this rule would tell you that the word for a close companion would be `"friend"` and not `"freind"`. For the `c` case, this
+means that when a package is mailed to you, you will `"receive"` it rather than `"recieve"` it.
+
+However, besides being incorrect for many cases (my weird foreign scientist neighbor taught me a few examples), it's not clear from this
+rule what to do with more unusual cases with multiple `i`s and `e`s.
+
+For the purposes of this kata our rule will be:
+
+> For any contiguous sequence of `i` or `e` characters, all the `i`s should come before all the `e`s. If, however, the sequence is
+> immediately preceded by a `c`, all the `e`s should come before all the `i`s.
+
+## Task
+
+Write a function which takes in a lowercase word and applies our version of the "I before E except after C" rule.
+
+#### Examples
+
+```
+"freind" --> "friend"
+"friend" --> "friend"
+"recieve" --> "receive"
+```
+
+You'll also need to account for the weirder cases that may not exist in real English words.
+
+```
+"eeiie" --> "iieee"
+"cieee" --> "ceeei"
+"eiicieeceie" --> "iieceeiceei"
+```

kata/7-kyu/i-before-e-except-after-c/main/Solution.java

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+import static java.util.regex.Pattern.compile;
+
+interface Solution {
+  static String iBeforeE(String s) {
+    return compile("c?([ie]+)").matcher(s).replaceAll(mr -> {
+      String es = mr.group(1).replace("i", "");
+      String is = mr.group(1).replace("e", "");
+      return mr.group().charAt(0) == 'c' ? "c" + es + is : is + es;
+    });
+  }
+}

kata/7-kyu/i-before-e-except-after-c/test/ExampleTests.java

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+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.CsvSource;
+
+class ExampleTests {
+  @ParameterizedTest
+  @CsvSource(textBlock = """
+      freind, friend
+      friend, friend
+      recieve, receive
+      feireist, fieriest
+      sciencier, sceinceir
+      deities, dieties
+      eeiie, iieee
+      cieee, ceeei
+      eiicieeceie, iieceeiceei
+      """)
+  void sample(String word, String expected) {
+    assertEquals(expected, Solution.iBeforeE(word));
+  }
+}

kata/7-kyu/index.md

@@ -273,6 +273,7 @@
 - [How Many Streets?](how-many-streets "66fc9ca2e6d1d0e9cc2e4a4c")
 - [How many urinals are free?](how-many-urinals-are-free "5e2733f0e7432a000fb5ecc4")
 - [Hungarian Vowel Harmony (easy)](hungarian-vowel-harmony-easy "57fd696e26b06857eb0011e7")
+- [I before E except after C](i-before-e-except-after-c "6834f1a80e0a48c2ea3feeb0")
 - [I Will Take the Biggest One and Nothing Else](i-will-take-the-biggest-one-and-nothing-else "631082840289bf000e95a334")
 - [Incrementer](incrementer "590e03aef55cab099a0002e8")
 - [Indexed capitalization](indexed-capitalization "59cfc09a86a6fdf6df0000f1")