rem: col_sep_string = (char *) xmalloc (col_sep_length + 1);
add: col_sep_string = xmalloc (col_sep_length + 1);
context: separator_string (const char *optarg_S){  col_sep_length = (int) strlen (optarg_S);  col_sep_string = (char *) xmalloc (col_sep_length + 1);  strcpy (col_sep_string, optarg_S);}