use strings.Join to build list of names

[grosser]

random little cleanup to make the code more readable / ideomatic
... what we are doing is joining string together, so use strings.Join instead of buffer math

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[mwielgus]

It seems that there are compilation problems there. Please fix.

[grosser]

thx, fixed!

[mwielgus]

/lgtm
/approve

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