Added a cancellation channel to interrupt a goroutine #11
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I had to check with arp request 5 networks 192.x.x.x/ 23 and 2 networks 192.x.x.x/ 22.
I did it sequentially in a loop, and I ran into a problem that sometimes func PingOverIface () hangs without returning a result, as if somewhere to lock a goroutine.
I added a cancellation channel and that solved my problem.