✅ Probably a simple general knowledge question, not to sure what to title it?

Im trying to store some data in a seperate file and then use it in a string but for some reason the string seems to come out as 2 strings which split at the variable?

string data = File.ReadAllText("./ntfFuoyFGA7qts1i/MDBP.txt");
string MDBLink = String.Format("hello {0}", data);

for some reason returns
hello
/data/

and im trying to make it return
hello /data/