Create 482. License Key Formatting.java

Author: futurus

482. License Key Formatting.java

@@ -0,0 +1,15 @@
+public class Solution {
+    public String licenseKeyFormatting(String S, int K) {
+        String pre = S.replace("-", "");
+        StringBuilder sb = new StringBuilder();
+        
+        for (int i = 0; i < pre.length(); i++) {
+            sb.append(pre.charAt(pre.length() - 1 - i));
+            if (i % K == (K-1) && (i != pre.length() - 1)) {
+                sb.append("-");
+            }
+        }
+        
+        return sb.reverse().toString().toUpperCase();
+    }
+}