I have below class
class Cdata12Mnt { public: char IOBname[ID1_IOB_PIOTSUP-ID1_IOB_TOP][BOADNAM_MAX + 4]; char ExIOBname[ID1_MAX_INF-ID1_EXIOB_U1TOP]
This warning is about unsafe use of strcpy. Try IOBname[ii]='\0'; instead.
IOBname[ii]='\0';