I have a collection from a api call where i have field called links, as below image

Now I need to loop through these 100 records like this and match with the company number that i have.
To achieve this i Have written below code but that does not work

   var company_number=12345678;
   var abc = newAppointmentList.items
                      .Where(a => a.links.company.Split('/')[2] == company_number)
                      .FirstOrDefault() 
if(abc != null)
{
  //insert that record only 
}

I have also tried the other way

var company_number=12345678;
   var abc = newAppointmentList.items
                      .Where(a => a.links.company.contains(company_number))
                      .FirstOrDefault()
if(abc != null)
{
  //insert that record only 
}

both code not matching any record while i have data for the same from api .