c++ - Initializing char* and allocating memory for a specific amount adds nullptr characters

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Answer 1

Initializing char* and allocating memory for a specific amount adds nullptr characters

There is no such thing as a "nullptr character". You may be referring to the null terminator character, which is not a pointer and therefore not "nullptr".

'0'

This is not the null terminator literal. This is character literal for the numeral digit 0. The literal for the null terminator is ''.

What I get from this char* ...

This is presumably because the array is not null terminated and consequently the behaviour of the program would be undefined if you pass it to a character stream which would require a string to be null terimnated.