Message error is missing

[Diogofornazari]

Tool doesn't return error if IP is invalid ( you can put any value, invalid values (zxvf:mlpr9:...) and the return is always 0, like if it was okay); if block 8 is suppressed it doesn't show ip address and it doesn't show any error (abff:0:ed4a:123f:ddd:3e4f:104f::);

Examples #: netcalc zxvm:lçvd:: && echo Ok #: Ok

#: netcalc 2fe1:d200:0:0:0:c801:a68:: 64 #: echo $? #: 0