moveZeros.cs

        public static void moveZeros(ref int[] numbers)
        {
            // Create a new array of the same size, NOTE: it's already initialized with zeros
            var newArray = new int[numbers.Length];

            // the "otherIndex" is used to separately track non-zero entries in the copy
            int otherIndex = 0;

            for (int index = 0; index < numbers.Length; index++)
            {
                // only assign into newArray when an entry is non-zero
                if (numbers[index] != 0)
                {
                    // NOTE: incrementing otherIndex here
                    newArray[otherIndex++] = numbers[index]; 
                }
            }

            numbers = newArray;
        }