system-praktyk-api/src/InternshipSystem.Core/ValueObject/Nip.cs

namespace InternshipSystem.Core
{
    public class Nip
    {
        private readonly string nip;
        
        public Nip()
        {
        }

        private Nip(string maybeNip)
        {
            nip = maybeNip;
        }

        public static implicit operator string(Nip nip) =>
            nip.nip;

        public static implicit operator Nip(string maybeNip) =>
            new Nip(maybeNip);
    }
}