fix: move test file to correct directory and format with clang-format

Author: konduri-lakshmi-prasanna

src/main/java/com/thealgorithms/strings/StringRotationTest.java renamed to src/test/java/com/thealgorithms/strings/StringRotationTest.java

@@ -1,6 +1,7 @@
-package com.thealgorithms.strings;
+package com.thealgorithms;
 
 import static org.junit.jupiter.api.Assertions.*;
+
 import org.junit.jupiter.api.Test;
 
 public class StringRotationTest {