Copying some strings from pointer array in C++

I have a string pointer like below, char *str = "This is cool stuff"; Now, I've references to this string pointer like below, char* start = str + 1; char* end = str + 6; So, `start` and `end` are pointing to different locations of `*str`. How can I copy the string chars falls between start and end into a new string pointer. Any existing C++/C function is preferable.
this is 'c', not 'c++', in 'c++' one would use either a string class or an array class (I HOPE).

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