Token function in a string class

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C++

Theres this function of a String class

void split(char token, String *&, int &ntokens);

And it should should split the string according to given token and store all substrings in a dynamic array passed as second argument, and return ntokens in third argument.

Unfortunately, I don't understand the problem neither the description given as well as well as the arguments of the function. Help would be appreciated.

Note: We are not allowed to use cstring functions.

What I have tried:

I don't understand the problem, therefore, haven't tried it.