Clarifying further for the devs dealing first time with `str` structure: the functions
working with them do not change the content of the input value, it sets (shifts) the start
pointer `str.s` and adjusts the length `str.len`.
Also, in many cases the str.s does not point to a zero-terminated string value of length
str.len, that's why printing it in logs must be done with `%.*s` which requires first
to provide the lenght. There are acases when str.s points to a zero-terminated string, but
the developer has to track the origin of the value and be sure it is zero-terminated.
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