2.Data Clump - Problem Code

namespace SecondExample
{
    class Program
    {
        public class Cat
        {
            public Cat(string name, string ownerFirstName, string ownerLastName)
            {
                this.Name = name;
                this.OwnerFirstName = ownerFirstName;
                this.OwnerLastName = ownerLastName;
            }
            public string Name { get; }
            public string OwnerFirstName { get; }
            public string OwnerLastName { get; }
        }
        public class Dog
        {
            public Dog(string name, string ownerFirstName, string ownerLastName)
            {
                this.Name = name;
                this.OwnerFirstName = ownerFirstName;
                this.OwnerLastName = ownerLastName;
            }
            public string Name { get; }
            public string OwnerFirstName { get; }
            public string OwnerLastName { get; }
        }
    }
}