solves license key formatting

Author: anishLearnsToCode

README.md

@@ -125,7 +125,7 @@
 | 463 | [Island Perimeter](https://leetcode.com/problems/island-perimeter) | Easy | [![Java](https://img.icons8.com/color/40/000000/java-coffee-cup-logo.png)](src/IslandPerimeter.java) [![Python](https://img.icons8.com/color/35/000000/python.png)](python/island_perimeter.py) |
 | 475 | [Heaters](https://leetcode.com/problems/heaters) | Medium | |
 | 476 | [Number Complement](https://leetcode.com/problems/number-complement) | Easy | [![Java](https://img.icons8.com/color/40/000000/java-coffee-cup-logo.png)](src/NumberComplement.java) |
-| 482 | [License Key Formatting](https://leetcode.com/problems/license-key-formatting) | Easy | |
+| 482 | [License Key Formatting](https://leetcode.com/problems/license-key-formatting) | Easy | [![Java](https://img.icons8.com/color/40/000000/java-coffee-cup-logo.png)](src/LicenseKeyFormatting.java) |
 | 485 | [Max Consecutive Ones](https://leetcode.com/problems/max-consecutive-ones) | Easy | |
 | 492 | [Construct the Rectangle](https://leetcode.com/problems/construct-the-rectangle) | Easy | |
 | 496 | [Next Greater Element I](https://leetcode.com/problems/next-greater-element-i) | Easy | |

src/LicenseKeyFormatting.java

@@ -0,0 +1,18 @@
+import java.util.Arrays;
+
+public class LicenseKeyFormatting {
+    public String licenseKeyFormatting(String S, int K) {
+        String[] groups = S.split("-");
+        String characters = String.join("", groups).toUpperCase();
+
+        StringBuilder result = new StringBuilder();
+        for (int index = characters.length() - 1, counter = 0 ; index >= 0 ; index--, counter++) {
+            if (counter % K == 0 && counter != 0) {
+                result.append('-');
+            }
+            result.append(characters.charAt(index));
+        }
+
+        return result.reverse().toString();
+    }
+}