feat: kata/return-substring-instance-count (#835)

* docs: kata description

* feat: kata/return-substring-instance-count

---------

Co-authored-by: ParanoidUser <5120290+ParanoidUser@users.noreply.github.com>

Author: github-actions[bot]

kata/7-kyu/index.md

@@ -440,6 +440,7 @@
 - [Replace every nth](replace-every-nth "57fcaed83206fb15fd00027a")
 - [Resistor Color Codes](resistor-color-codes "57cf3dad05c186ba22000348")
 - [Responsible Drinking](responsible-drinking "5aee86c5783bb432cd000018")
+- [Return substring instance count](return-substring-instance-count "5168b125faced29f66000005")
 - [Return the first M multiples of N](return-the-first-m-multiples-of-n "593c9175933500f33400003e")
 - [Reverse a Number](reverse-a-number "555bfd6f9f9f52680f0000c5")
 - [Reverse the bits in an integer](reverse-the-bits-in-an-integer "5959ec605595565f5c00002b")

kata/7-kyu/return-substring-instance-count/README.md

@@ -0,0 +1,17 @@
+# [Return substring instance count](https://www.codewars.com/kata/return-substring-instance-count "https://www.codewars.com/kata/5168b125faced29f66000005")
+
+Write a function that takes two string parameters `search_text` and `full_text` and returns the number of times the `search_text` is found
+within the `full_text`.
+
+* Overlap is not permitted: `"aaa"` contains `1` instance of `"aa"`, not `2`.
+* `search_text` will never be empty.
+
+## Examples:
+
+```
+full_text = "aa_bb_cc_dd_bb_e", search_text = "bb"
+-- > should return 2 since "bb" shows up twice
+
+full_text = "aaabbbcccc", search_text = "bbb"
+-- > should return 1
+```

kata/7-kyu/return-substring-instance-count/main/Solution.java

@@ -0,0 +1,5 @@
+interface Solution {
+  static int substringCount(String fullText, String search) {
+    return (fullText + "_").split(search).length - 1;
+  }
+}

kata/7-kyu/return-substring-instance-count/test/SolutionTest.java

@@ -0,0 +1,18 @@
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.CsvSource;
+
+class SolutionTest {
+  @ParameterizedTest
+  @CsvSource(delimiter = '|', textBlock = """
+      abcdeb | b | 2
+      abcdeb | a | 1
+      ccddeeccddeecc | cc | 3
+      aaabbbccc | bb | 1
+      ,,,..239,,,,,., | ,, | 3
+      """)
+  void sample(String fullText, String search, int expected) {
+    assertEquals(expected, Solution.substringCount(fullText, search));
+  }
+}