Why wont my code run?

#include

#include

#include

using namespace std;

class ShoppingCart $\{$

private:

struct Item $\{$

string name;

$\}$;

vector items;

public:

$//$ Function to add an item to the cart

void addItem$($string name$)\{$

Item newItem;

newItem.name $=$ name;

items.push$\_$back$($newItem$)$;

$\}$

$//$ Function to remove an item from the cart

void removeItem$($string name$)\{$

for $($auto it $=$ items.begin$()$; it $!=$ items.end$()$; $++$it$)\{$

if $($it$->$name $==$ name$)\{$

items.erase$($it$)$;

cout $$ "Item $\text{'}"$ name removed from cart." $$ endl;

return;

$\}$

$\}$

cout $$ "Item $\text{'}"$ name not found in the cart." $$ endl;

$\}$

$//$ Function to display the items in the cart

void listItems$()\{$

if $($items$.$empty$())\{$

cout $$ "The cart is empty." $$ endl;

return;

$\}$

cout $$ "Items in the cart:" $$ endl;

for $($const auto& item : items$)\{$

cout item.name $$ endl;

$\}$

$\}$

$//$ Function to get the number of items in the cart

int getNumOfItems$()\{$

return items.size$()$;

$\}$

$//$ Function to clear the cart

void clearCart$()\{$

items.clear$()$;

cout $$ "Cart cleared." $$ endl;

$\}$

$//$ Function to save the content of the cart to a file

void saveCart$($string filename$)\{$

ofstream file$($filename$)$;

if $($file$.$is$\_$open$())\{$

for $($const auto& item : items$)\{$

file $$ item.name $$ endl;

$\}$

file.close$()$;

cout $$ "Cart saved to $"$ filename $$ endl;

$\}$ else $\{$

cout $$ "Unable to open file." $$ endl;

$\}$

$\}$

$//$ Overloading the insertion operator to display the content of the cart

friend ostream& operatorostream& os$,$ const ShoppingCart& cart$)\{$

os $$ "Items in the cart:" $$ endl;

for $($const auto& item : cart.items$)\{$

os item.name $$ endl;

$\}$

return os;

$\}$

$\}$;

int main$()\{$

ShoppingCart cart;

cart.addItem$("$Laptop$")$;

cart.addItem$("$Phone$")$;

cart.addItem$("$Book$")$;

cout $$ "Number of items in the cart: $"$ cart.getNumOfItems$()$ endl;

cout $$ cart; $//$ Display items in the cart using operator$$

cart.removeItem$("$Phone$")$;

cart.removeItem$("$Tablet$")$;

cout $$ "Number of items in the cart: $"$ cart.getNumOfItems$()$ endl;

cart.listItems$()$;

cart.clearCart$()$;

cout $$ "Number of items in the cart: $"$ cart.getNumOfItems$()$ endl;

cart.saveCart$("$cart$.$txt$")$;

return $0$;

$\}$