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Looks like we don't need sprintf for how it's used. Replacing sprintf makes it
more performant (~2.4x as fast), and less memory, allocations:
BenchmarkGetRandomName-8 8203230 142.4 ns/op 37 B/op 2 allocs/op
BenchmarkGetRandomNameOld-8 3499509 342.9 ns/op 85 B/op 5 allocs/op
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>