trim string in c

Реализации:

1) https://stackoverflow.com/questions/656542/trim-a-string-in-c

2) https://stackoverflow.com/questions/122616/how-do-i-trim-leading-trailing-whitespace-in-a-standard-way

3) http://microsin.net/programming/arm/trim-c-cpp.html

4) https://www.delftstack.com/howto/c/trim-string-in-c/#use-custom-function-to-trim-a-string-in-c

5) https://gist.github.com/kenkam/790090

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