refactor:상수 관리 enum 클래스 생성

Author: whrjsgml0000

src/main/java/calculator/constant/CalConst.java

@@ -0,0 +1,19 @@
+package calculator.constant;
+
+public enum CalConst {
+    MINIMUM_LENGTH_IF_EXIST_CUSTOM_SEPARATOR(5),
+    START_INDEX_OF_CALCULATING(5),
+    END_INDEX_OF_CUSTOM_SEPARATOR(3),
+    INDEX_OF_CUSTOM_SEPARATOR(2),
+    ;
+
+    private final int value;
+
+    CalConst(int value) {
+        this.value = value;
+    }
+
+    public int value() {
+        return value;
+    }
+}