public void test_null()
        {
            var target = new remove_duplicates_from_sorted_array();

            int[] arr = null;
            var   res = target.RemoveDuplicates(arr);

            Assert.True(res == 0);

            arr = new int[] { };
            res = target.RemoveDuplicates(arr);
            Assert.True(res == 0);
        }
        public void test()
        {
            var target = new remove_duplicates_from_sorted_array();

            var arr = new int[] { 1, 1, 2 };
            var res = target.RemoveDuplicates(arr);

            Assert.True(res == 2);

            arr = new int[] { 0, 0, 1, 1, 1, 2, 2, 3, 3, 4 };
            res = target.RemoveDuplicates(arr);
            Assert.True(res == 5);
        }