Use time.Since()

[cn0047]

In src/benchmark/main.go replace:

startedAt := time.Now().UnixNano()
f()
finishedAt := time.Now().UnixNano()

fmt.Printf("Action: %s, took: %d microseconds \n\n", actionName, (finishedAt - startedAt) / 1000)

with using time.Since function.