public void Update(string ssn, TestCenterCitizen testCenterCitizenIn) => _testcentercitizen.ReplaceOne(testcentercitizen => testcentercitizen.SSN == ssn, testCenterCitizenIn);
 public void Remove(TestCenterCitizen testCenterCitizenIn) => _testcentercitizen.DeleteOne(testcentercitizen => testcentercitizen.SSN == testCenterCitizenIn.SSN);
        //CRUD operations

        public TestCenterCitizen Create(TestCenterCitizen testCenterCitizen)
        {
            _testcentercitizen.InsertOne(testCenterCitizen);
            return(testCenterCitizen);
        }