find_element
find_element(*argv, &cmd.cm_fromtype, &cmd.cm_fromunit);
find_element(*argv, &cmd.ce_srctype, &cmd.ce_srcunit);
find_element(*argv, &cmd.ce_fdsttype, &cmd.ce_fdstunit);
static void find_element(char *, uint16_t *, uint16_t *);
find_element(*argv, &type, &element);