Remove headers which are redefining function

src/currentCustomerAccountBalance.c

@@ -1,5 +1,4 @@
 #include "currentCustomerAccountBalance.h"
-#include "_file_information.h"
 
 float fetchBalanceFromBalanceString(char balance_String[MAX_LENGTH]) {
     float balance = 0;

src/updateCustomerAccountBalance.c

@@ -1,5 +1,4 @@
 #include "updateCustomerAccountBalance.h"
-#include "currentCustomerAccountBalance.c"
 #include "lineReplacer.h"
 #include "_file_information.h"
 

tests/test_updateCustomerAccountBalance.c

@@ -1,4 +1,4 @@
-#ifndef TEST
+#ifdef TEST
 
 #include "unity.h"