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Help pls, Scraped this project from some site for education purpose, Question is why string not gettin add to struct ? after mem allocate

https://sololearn.com/compiler-playground/c79aLq16PNS2/?ref=app
https://sololearn.com/compiler-playground/c5ChlTAxZiZ3/?ref=app
https://sololearn.com/compiler-playground/c33GgxURKH5K/?ref=app
https://sololearn.com/compiler-playground/cv6tr7ziGu67/?ref=app
https://sololearn.com/compiler-playground/cn579bwqJZF2/?ref=app

output:
the device playback.

Default is output.
Freed memory.

Some wrong with output