refactor: rename variable name [exception]

Author: oereo

src/main/java/calculator/Calculator.java

@@ -13,14 +13,14 @@ public void calculation(){
     }
 
     public void OperatorSetting(ArithmeticExpressionStack arithmeticExpressionStack) {
-        ErrorException exception = new ErrorException();
+        ErrorException exceptionCheck = new ErrorException();
         String firstString = arithmeticExpressionStack.pop();
-        int cumulativeResult = exception.NumericalError(firstString);
+        int cumulativeResult = exceptionCheck.NumericalError(firstString);
 
         for(int i = 0; i<(arithmeticExpressionStack.getStackSize())/2;i++){
             String operator = arithmeticExpressionStack.pop();
             String secondString = arithmeticExpressionStack.pop();
-            int secondNumber = exception.NumericalError(secondString);
+            int secondNumber = exceptionCheck.NumericalError(secondString);
             cumulativeResult = chooseOperatorAndCalculate(cumulativeResult, operator, secondNumber);
         }