Pergunta de entrevista da empresa Canva: How can we write multiple strings to a file while keeping them separated?

Canva

How can we write multiple strings to a file while keeping them separated?

Sigiloso

15 de mai. de 2019

Base64 encode, and write them in a file line by line.

Sigiloso

31 de ago. de 2017

Hint: Using special characters, e.g. newlines, alone doesn't work well if you have arbitrary user inputs.

Sigiloso

21 de mar. de 2019

If arbitrary can be only text/string input, then any non-printable character should do the job.