big.NewInt(int64(unsafe.Sizeof(char))))
also this line will will define the maximum of the random number which
is 4. so all the random runes are 0 <= r <= 4 which are all not graphic.
is this more what you expect https://play.golang.org/p/61hzuNj1nF
it uses append instead of the decrementing i and math/rand instead of
crypto/rand
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