feat(7-kyu): kata/a-letters-best-friend (#597)

docs/README.md

@@ -1,7 +1,7 @@
 # Codewars Handbook ☕️🚀
 
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@@ -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 | 426 | 572 | 210 | 56 | 79 |
+| 0 | 1 | 2 | 26 | 48 | 426 | 573 | 210 | 56 | 79 |
 
 **Note:** The source code is written in Java 17 and may use language features that are incompatible
 with Java 8, 11.

kata/7-kyu/a-letters-best-friend/README.md

@@ -0,0 +1,32 @@
+# [A Letter's Best Friend](https://www.codewars.com/kata/a-letters-best-friend "https://www.codewars.com/kata/64fc03a318692c1333ebc04c")
+
+### Task
+
+Given a string, return if all occurrences of a given letter are always immediately followed by the other given letter.
+
+### Worked Example
+
+```
+("he headed to the store", "h", "e") ➞ True
+
+# All occurences of "h": ["he", "headed", "the"]
+# All occurences of "h" have an "e" after it.
+# Return True
+
+('abcdee', 'e', 'e') ➞ False
+
+# For first "e" we can get "ee"
+# For second "e" we cannot have "ee"
+# Return False
+```
+
+### Examples
+
+```
+("i found an ounce with my hound", "o", "u") ➞ True
+("we found your dynamite", "d", "y") ➞ False
+```
+
+### Notes
+
+- All sentences will be given in lowercase.

kata/7-kyu/a-letters-best-friend/main/Kata.java

@@ -0,0 +1,5 @@
+interface Kata {
+  static boolean bestFriend(String txt, char a, char b) {
+    return !txt.matches(".*" + a + "(?!" + b + ").*");
+  }
+}

kata/7-kyu/a-letters-best-friend/test/SolutionTest.java

@@ -0,0 +1,31 @@
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.CsvSource;
+
+class SolutionTest {
+  @ParameterizedTest
+  @CsvSource(textBlock = """
+      '', x, y
+      xaeaex, a, e
+      he headed to the store, h, e
+      i found an ounce with my hound, o, u
+      those were their thorns they said, t, h
+      """)
+  void friends(String txt, char a, char b) {
+    assertTrue(Kata.bestFriend(txt, a, b));
+  }
+
+  @ParameterizedTest
+  @CsvSource(textBlock = """
+      a test, t, e
+      abcdee, e, e
+      abcde, e, e
+      we found your dynamite, d, y
+      look they took the cookies, o, o
+      """)
+  void strangers(String txt, char a, char b) {
+    assertFalse(Kata.bestFriend(txt, a, b));
+  }
+}

kata/7-kyu/index.md

@@ -8,6 +8,7 @@
 - [80's Kids #3: Punky Brewster's Socks](80-s-kids-number-3-punky-brewsters-socks)
 - [80's Kids #5: You Can't Do That on Television](80-s-kids-number-5-you-cant-do-that-on-television)
 # A
+- [A Letter's Best Friend](a-letters-best-friend)
 - [A Man and his Earthly Measurement](a-man-and-his-earthly-measurement)
 - [A Rule of Divisibility by 7](a-rule-of-divisibility-by-7)
 - [Acronym Generator](acronym-generator)