good point!

in fact, it's failed with sample test for below case:

 should test that 123.045.067.089 is uncorrect

and it accepted IPv6 address according to https://golang.org/pkg/net/#ParseIP

yeah, you're right. I found a defect in my code. And all passed now after fix it. Thanks.

This kata also appears broken in Golang. I did pass all sample test but failed basic or random tests after I click attempt. I can't see any logical issue in my code.

Expected
    <string>: owiaxujylentrklctozmymuwpgozvxxiu
to equal
    <string>: wlwsasphmxxowiaxujylentrklctozmymu