The f_unlink function removes a file or sub-directory.
FRESULT f_unlink ( const TCHAR* path /* [IN] Object name */ );
FR_OK, FR_DISK_ERR, FR_INT_ERR, FR_NOT_READY, FR_NO_FILE, FR_NO_PATH, FR_INVALID_NAME, FR_DENIED, FR_EXIST, FR_WRITE_PROTECTED, FR_INVALID_DRIVE, FR_NOT_ENABLED, FR_NO_FILESYSTEM, FR_TIMEOUT, FR_LOCKED, FR_NOT_ENOUGH_CORE
If condition of the object to be removed is applicable to the following terms, the function will be rejected.
Available when _FS_READONLY == 0 and _FS_MINIMIZE == 0.