Go golang solution
Runtime: 8 ms, faster than 100.00% of Go online submissions for Concatenation of Array.\nMemory Usage: 6.4 MB, less than 100.00% of Go online submissions for Co
>Runtime: 8 ms, faster than 100.00% of Go online submissions for Concatenation of Array.\nMemory Usage: 6.4 MB, less than 100.00% of Go online submissions for Concatenation of Array.\n\n```go\nfunc getConcatenation(nums []int) []int {\n    return append(nums, nums...)\n}\n```
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