Simple, C++ (gcc) - rextester

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#include<iostream>
#include<set>
#include<string>

using std::string;
using std::set;
using std::cout;
using std::cin;
using std::endl;

class Hero
{
public:
    //...
  void delInv(const string& arg);
  void setInv(const string& inv);
  void printInv() const;
    //...
private:
    //...
  set<string> invertory;
};

void Hero::delInv(const string& arg)
{
  if(arg.size() > 0)
  {
    auto i = invertory.find(arg);
    if(i != invertory.end())
    {
      invertory.erase(i);
      cout << "\n-- " << arg << " удален" << endl;
    }
  }
}

void Hero::setInv(const string& inv)
{
  if(inv.size() > 0)
  {
    if(invertory.find(inv) == invertory.end())
    {
      invertory.insert(inv);
    }
  }
}

void Hero::printInv() const
{
  cout << "[Ваш инвентарь]\n";

for(const auto & i : invertory)
  {
    cout << "# " << i << "\n";
  }
}

int main(int argc, char* argv[])
{

Hero myHero;

myHero.setInv("Скрепка");
  myHero.setInv("Спичка");
  myHero.setInv("Зажигалка");

myHero.printInv();

cout << "Что удалить?\n$: ";
  
  string arg;
  getline(cin, arg);
    
  myHero.delInv(arg);

myHero.printInv();
}

Show compiler warnings [ + ] Compiler args [ - ] Show input
Compilation time: 0.52 sec, absolute running time: 0.07 sec, cpu time: 0.01 sec, memory peak: 3 Mb, absolute service time: 0,61 sec