#include <iostream>
#include <algorithm>
#include <string>

void actuallyRemoveOccurrencesThanksYouVeryMuch(std::string& str, char charToRemove) {
    str.erase(std::remove(str.begin(), str.end(), charToRemove), str.end());
}

int main() {
    std::string s = "#Hello #World!!";
    actuallyRemoveOccurrencesThanksYouVeryMuch(s, '#');
    std::cout << s;
}