You are given a list of integers and an integer target, return a list of a pair of numbers in any order such that they add up to target. If there is no such pair of numbers, then return an empty list
One example: [2,4,5,6,4,8,9,10], target=10
Solution is here: [2,8]
Explanation: 2 and 8 are present in the list and sum to 10 which was the target sum

Now, solve this: [8, 37, 11, 21, 18, 13, 7, 40, 29, 17, 2, 15, 39, 34, 27, 42, 16, 47, 33, 23], target=31
Solution:
[18, 13]