@Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        Participant that = (Participant) o;

        if (email != null ? !email.equals(that.email) : that.email != null) return false;
        if (name != null ? !name.equals(that.name) : that.name != null) return false;

        return true;
    }