add 3210

Author: fishercoder1534

paginated_contents/algorithms/4th_thousand/README.md

@@ -1,5 +1,6 @@
 | #    | Title                                                                                                                                                               | Solutions                                                                                                                         | Video                                                                         | Difficulty | Tag                                                                  
 |------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------|-------------------------------------------------------------------------------|------------|----------------------------------------------------------------------
+| 3210 | [Find the Encrypted String](https://leetcode.com/problems/find-the-encrypted-string/)                                                                                       | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3210.java) |                                                                               | Easy       |
 | 3208 | [Alternating Groups II](https://leetcode.com/problems/alternating-groups-ii/)                                                                                       | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3208.java) |                                                                               | Medium     |
 | 3206 | [Alternating Groups I](https://leetcode.com/problems/alternating-groups-i/)                                                                                         | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3206.java) |                                                                               | Easy       |
 | 3200 | [Maximum Height of a Triangle](https://leetcode.com/problems/maximum-height-of-a-triangle/)                                                                         | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3200.java) |                                                                               | Easy       |

src/main/java/com/fishercoder/solutions/fourththousand/_3210.java

@@ -0,0 +1,13 @@
+package com.fishercoder.solutions.fourththousand;
+
+public class _3210 {
+    public static class Solution1 {
+        public String getEncryptedString(String s, int k) {
+            StringBuilder sb = new StringBuilder();
+            for (int i = 0; i < s.length(); i++) {
+                sb.append(s.charAt((i + k) % s.length()));
+            }
+            return sb.toString();
+        }
+    }
+}