style: format code (#4212)

close #4204

src/test/java/com/thealgorithms/backtracking/PowerSumTest.java

@@ -1,5 +1,6 @@
 package com.thealgorithms.backtracking;
 import static org.junit.jupiter.api.Assertions.assertEquals;
+
 import org.junit.jupiter.api.Test;
 
 public class PowerSumTest {
@@ -17,12 +18,11 @@ public class PowerSumTest {
         int result = powerSum.powSum(100, 2);
         assertEquals(3, result);
     }
-  
+
     @Test
     void testNumberHundredAndPowerThree() {
         PowerSum powerSum = new PowerSum();
         int result = powerSum.powSum(100, 3);
         assertEquals(1, result);
     }
-    
 }