style: format code (#4212)

close #4204

src/test/java/com/thealgorithms/strings/LowerTest.java

@@ -1,16 +1,16 @@
 package com.thealgorithms.strings;
 
-import org.junit.jupiter.api.Test;
-
 import static org.junit.jupiter.api.Assertions.*;
 
+import org.junit.jupiter.api.Test;
+
 public class LowerTest {
     @Test
     public void toLowerCase() {
         String input1 = "hello world";
         String input2 = "HelLO WoRld";
         String input3 = "HELLO WORLD";
-        
+
         assertEquals("hello world", Lower.toLowerCase(input1));
         assertEquals("hello world", Lower.toLowerCase(input2));
         assertEquals("hello world", Lower.toLowerCase(input3));