Refactoring: remove unwanted codes

src/currentCustomerAccountBalance.h

@@ -3,10 +3,7 @@
 #include <string.h>
 #include <stdlib.h>
 
-//#include "_file_information.h"
-
-#define MAX_LENGTH 100
-#define CUSTOMER_DATA_FILE "CustomerData.txt"
+#include "_file_information.h"
 
 float getAvailableAccountBalance(int user_id);
 float fetchBalanceFromBalanceString(char balance_String[MAX_LENGTH]);