Code:
#define PROJECT_ID ram

#define QUOTES(FILENAME)  #FILENAME
#define DATA_VAR_FILENAME(PROJECT_ID) QUOTES(../##PROJECT_ID##_data_var.h)
#define DATA_VAR_FILE(PROJECT_ID) DATA_VAR_FILENAME(PROJECT_ID)
#define CUST_DATA_VAR_FILENAME DATA_VAR_FILE(PROJECT_ID)
when I tried to include CUST_DATA_VAR_F ILENAME like below
#include CUST_DATA_VAR_F ILENAME

Will get below error
error: pasting...