연관 컨테이너에서 map의 키로 값이 검색되지 않는데요..

#include <iostream>
using namespace std;
#include <map>
#include <utility>
#include <cstring>
struct Items {
	//char* name;
	string name;
	int price;
	int damage;
	char* in_english;
	Items(const Items& it) {
		name=it.name;
		in_english=new char[strlen(it.in_english)+1];
		strcpy(in_english, it.in_english);
		price=it.price;
		damage=it.damage;
	}
	Items(/*const char* _name*/ string _name, const char* _in_english,  int _price, int _damage) {
		//name=new char[strlen(_name)+1];
		//strcpy(name,_name);
		name=_name;
		in_english=new char[strlen(_in_english)+1];
		strcpy(in_english, _in_english);
		price=_price;
		damage=_damage;
	}
};
//mapped_type& operator[] (const key_type& k);
int main() {
	map<string ,Items>  arms;
	typedef map<string ,Items>::value_type itemtype;
	Items item1("불칼","fire sword",20000,40);
	Items item2("단검" , "short sword", 5000 , 10);
	Items item3("보검", "treasure sword",100000,80);
	cout<<item1.name<<"  "<<item1.price<<"    "<<item1.damage<<endl;
	cout<<item2.name<<"  "<<item2.price<<"    "<<item2.damage<<endl;
	cout<<item3.name<<"  "<<item3.price<<"    "<<item3.damage<<endl;
	//map은 컨테이너 안 각 요소에서 동적으로 할당된 메모리는 자동으로 해제되는  것으로 추론할 수 있다. 
	pair<string,Items> armspair=make_pair("불칼",item1);
	arms.insert(armspair);
	armspair=make_pair("단검",item2);
	arms.insert(armspair);
	armspair=make_pair("보검", item3);
	arms.insert(armspair);
	map<string,Items>::iterator first, last, current;
	first=arms.begin();
	last=arms.end();
 
 
	for(current=first;current!=last;++current) {
		cout<<current->first<<"  "<<(current->second).in_english<<"  ";
		//cout<<arms[current->first].in_in_english<<endl;
		cout<<current->second.price<<"  "<<current->second.damage<<endl;
	}
	arms["불칼"];//여기서 컴파일 오류가 발생합니다.
 
 
 
	return 0;
}