I don’t know whether Turnitin has a code plagiarism checker. Still, some other plagiarism checkers (e.g., Unicheck, MOSS) do have and they are applied at universities. Thus, I guess your website could be checked for plagiarism as well.
The idea to do everything the same way, but completely...
Such tools as Turnitin save all the submitted papers and assignments to educational databases of a university. When a student tries to cheat and submit a previously submitted paper or a paper of a friend, the software checks it through these databases and easily detects plagiarism.
Thus, I...
Unicheck plagiarism checker has this option to pre-check the draft before the final submission in Canvas. However, as far as I know, only the teacher can enable it for students and set a certain number of attempts.
I am not sure whether Turnitin has a similar option. Still, you can clarify this...