style. 개행 컨벤션 적용

Author: dh2906

src/main/java/domain/Calculator.java

@@ -1,6 +1,7 @@
 package domain;
 
 public class Calculator {
+
     public static final String DIVIDE_BY_ZERO = "0으로 나눌 수 없습니다.";
 
     public int add(int num1, int num2) {

src/main/java/domain/StringCalculator.java

@@ -5,6 +5,7 @@
 import java.util.regex.Pattern;
 
 public class StringCalculator {
+
     public static final String EMPTY_STRING = "문자열이 비어있습니다.";
     public static final String CUSTOM_DELIMITER_NOT_FOUND = "커스텀 구분자를 찾을 수 없습니다.";
     public static final String NEGATIVE_NUMBER_NOT_ALLOWED = "음수는 처리할 수 없습니다.";

src/test/java/CalculatorTest.java

@@ -4,6 +4,7 @@
 import static org.assertj.core.api.Assertions.*;
 
 public class CalculatorTest {
+
     private final Calculator calculator = new Calculator();
 
     @Test

src/test/java/StringCalculatorTest.java

@@ -10,6 +10,7 @@
 import static org.assertj.core.api.Assertions.*;
 
 public class StringCalculatorTest {
+
     private final StringCalculator stringCalculator = new StringCalculator();
 
     @ParameterizedTest