Kotlin, inline, <99%
Just assign to a simple array builder and choose the nums array index based off the new array index modulo original size.\n\n\nclass Solution {\n    fun getConc
Just assign to a simple array builder and choose the nums array index based off the new array index modulo original size.\n\n```\nclass Solution {\n    fun getConcatenation(nums: IntArray) = IntArray(nums.size * 2) { nums[it % nums.size] }\n}\n```
['Kotlin']