feat(strings): add StringRotation to check if one string is a rotation of another

Signed-off-by: konduri-lakshmi-prasanna <konduriprasanna22@gmail.com>

Author: konduri-lakshmi-prasanna

src/main/java/com/thealgorithms/strings/StringRotation.java

@@ -0,0 +1,45 @@
+package com.thealgorithms.strings;
+
+import java.util.Scanner;
+
+public class StringRotation {
+
+    /**
+     * Checks if str2 is a rotation of str1
+     * @param str1 Original string
+     * @param str2 String to check for rotation
+     * @return true if str2 is a rotation of str1, false otherwise
+     */
+    public static boolean isRotation(String str1, String str2) {
+        if (str1 == null || str2 == null) {
+            return false;
+        }
+
+        if (str1.length() != str2.length()) {
+            return false;
+        }
+
+        String concatenated = str1 + str1;
+        return concatenated.contains(str2);
+    }
+
+    public static void main(String[] args) {
+        Scanner scanner = new Scanner(System.in);
+
+        System.out.print("Enter first string: ");
+        String str1 = scanner.nextLine();
+
+        System.out.print("Enter second string: ");
+        String str2 = scanner.nextLine();
+
+        boolean result = isRotation(str1, str2);
+
+        if (result) {
+            System.out.println("\"" + str2 + "\" is a rotation of \"" + str1 + "\".");
+        } else {
+            System.out.println("\"" + str2 + "\" is NOT a rotation of \"" + str1 + "\".");
+        }
+
+        scanner.close();
+    }
+}