add 3083

Author: fishercoder1534

Diff for: paginated_contents/algorithms/4th_thousand/README.md

@@ -35,6 +35,7 @@
 | 3110 | [Score of a String](https://leetcode.com/problems/score-of-a-string/)                                                                                               | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3110.java) |                                                                               | Easy       |
 | 3095 | [Shortest Subarray With OR at Least K I](https://leetcode.com/problems/shortest-subarray-with-or-at-least-k-i/)                                                     | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3095.java) |                                                                               | Easy       |
 | 3090 | [Maximum Length Substring With Two Occurrences](https://leetcode.com/problems/maximum-length-substring-with-two-occurrences/)                                       | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3090.java) |                                                                               | Easy       |
+| 3083 | [Existence of a Substring in a String and Its Reverse](https://leetcode.com/problems/existence-of-a-substring-in-a-string-and-its-reverse/)                                                                   | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3083.java) |                                                                               | Easy       |
 | 3074 | [Apple Redistribution into Boxes](https://leetcode.com/problems/apple-redistribution-into-boxes/)                                                                   | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3074.java) |                                                                               | Easy       |
 | 3062 | [Winner of the Linked List Game](https://leetcode.com/problems/winner-of-the-linked-list-game/)                                                                     | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3062.java) |                                                                               | Easy       |
 | 3046 | [Split the Array](https://leetcode.com/problems/split-the-array/)                                                                                                   | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3046.java) |                                                                               | Easy       |

Diff for: src/main/java/com/fishercoder/solutions/fourththousand/_3083.java

@@ -0,0 +1,18 @@
+package com.fishercoder.solutions.fourththousand;
+
+public class _3083 {
+    public static class Solution1 {
+        public boolean isSubstringPresent(String s) {
+            StringBuilder sb = new StringBuilder();
+            for (int i = 0; i < s.length() - 1; i++) {
+                sb.append(s.charAt(i + 1));
+                sb.append(s.charAt(i));
+                if (s.indexOf(sb.toString()) != -1) {
+                    return true;
+                }
+                sb.setLength(0);
+            }
+            return false;
+        }
+    }
+}

Diff for: src/test/java/com/fishercoder/fourththousand/_3083Test.java

@@ -0,0 +1,22 @@
+package com.fishercoder.fourththousand;
+
+import com.fishercoder.solutions.fourththousand._3083;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+public class _3083Test {
+    private static _3083.Solution1 solution1;
+
+    @BeforeEach
+    public void setup() {
+        solution1 = new _3083.Solution1();
+    }
+
+    @Test
+    public void test1() {
+        assertTrue(solution1.isSubstringPresent("leetcode"));
+    }
+
+}