solves #3210: Find the Encrypted String in java

Author: anishLearnsToCode

Diff for: README.md

@@ -925,7 +925,7 @@
 | 3199 | 🔒 [Count Triplets With Even XOR Set Bits I](https://leetcode.com/problems/count-triplets-with-even-xor-set-bits-i)                                                    |                                                                                                                                                                                                                                  |                                                                                                                                   |
 | 3200 | [Maximum Height of a Triangle](https://leetcode.com/problems/maximum-height-of-a-triangle)                                                                             |                                                                                  [![Java](assets/java.png)](src/MaximumHeightOfATriangle.java)                                                                                   |                                                                                                                                   |
 | 3206 | [Alternating Groups I](https://leetcode.com/problems/alternating-groups-i)                                                                                             |                                                                                     [![Java](assets/java.png)](src/AlternatingGroupsI.java)                                                                                      |                                                                                                                                   |
-| 3210 | [Find the Encrypted String](https://leetcode.com/problems/find-the-encrypted-string)                                                                                   |                                                                                                                                                                                                                                  |                                                                                                                                   |
+| 3210 | [Find the Encrypted String](https://leetcode.com/problems/find-the-encrypted-string)                                                                                   |                                                                                   [![Java](assets/java.png)](src/FindTheEncryptedString.java)                                                                                    |                                                                                                                                   |
 | 3216 | [Lexicographically Smallest String After a Swap](https://leetcode.com/problems/lexicographically-smallest-string-after-a-swap)                                         |                                                                                                                                                                                                                                  |                                                                                                                                   |
 | 3222 | [Find the Winning Player in Coin Game](https://leetcode.com/problems/find-the-winning-player-in-coin-game)                                                             |                                                                                                                                                                                                                                  |                                                                                                                                   |
 | 3226 | [Number of Bit Changes to Make Two Integers Equal](https://leetcode.com/problems/number-of-bit-changes-to-make-two-integers-equal)                                     |                                                                                                                                                                                                                                  |                                                                                                                                   |

Diff for: src/AlternatingGroupsI.java

@@ -14,6 +14,6 @@ public int numberOfAlternatingGroups(int[] colors) {
     }
     private static boolean isAlternating(int[] colors, int startIndex) {
         return colors[startIndex] == colors[(startIndex + 2) % colors.length] &&
-                colors[startIndex] != colors[(startIndex + 1) % colors.length]
+                colors[startIndex] != colors[(startIndex + 1) % colors.length];
     }
 }

Diff for: src/FindTheEncryptedString.java

@@ -0,0 +1,21 @@
+// https://leetcode.com/problems/find-the-encrypted-string
+// T: O(|s|)
+// S: O(|s|)
+
+public class FindTheEncryptedString {
+    public String getEncryptedString(String s, int k) {
+        final int rotations = k % s.length();
+        if (rotations == 0) {
+            return s;
+        }
+        return rotateString(s, rotations);
+    }
+
+    private static String rotateString(String s, int rotations) {
+        final StringBuilder builder = new StringBuilder();
+        for (int i = 0 ; i < s.length() ; i++) {
+            builder.append(s.charAt((i + rotations) % s.length()));
+        }
+        return builder.toString();
+    }
+}