C++ Remove punctuation from String

Question

I got a string and I want to remove all the punctuations from it. How do I do that? I did some research and found that people use the ispunct() function (I tried that), but

Answer 1

#include 
#include 
#include 
using namespace std;

int main() {
    string str = "this. is my string. it's here.";

    transform(str.begin(), str.end(), str.begin(), [](char ch)
    {
        if( ispunct(ch) )
            return '\0';
        return ch;
    });
}