Linq Challenge - Epand the Range

Input: string "2, 3-5, 7", Out put => [2,3,4,5,7]. Hint: we need to expand this range " 2, 3-5, 7" to order [2, 3, 4, 5 , 7 ], we will notice that "6" is not exist in range as is not in string. Explanation: expand range from "3-5", then distinct va...