refactor:변수 이름 변경

Author: whrjsgml0000

src/main/java/calculator/Application.java

@@ -4,10 +4,10 @@
 import calculator.controller.CalculatorController;
 
 public class Application {
-    private static final Configuration configuration = Configuration.getInstance();
+    private static final Configuration CONFIGURATION = Configuration.getInstance();
 
     public static void main(String[] args) {
-        CalculatorController calculatorController = configuration.getCalculatorController();
+        CalculatorController calculatorController = CONFIGURATION.getCalculatorController();
         calculatorController.input();
     }
 }

src/main/java/calculator/config/Configuration.java

@@ -3,14 +3,14 @@
 import calculator.controller.CalculatorController;
 
 public class Configuration {
-    private static final Configuration configuration = new Configuration();
+    private static final Configuration CONFIGURATION = new Configuration();
     private final CalculatorController calculatorController = new CalculatorController();
 
     private Configuration() {
     }
 
     public static Configuration getInstance() {
-        return configuration;
+        return CONFIGURATION;
     }
 
     public CalculatorController getCalculatorController() {