How to call this function?

So I am at the beginning of my task and I need to call function "creating" inside the main function...How to do it? This is my code.
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#include <iostream>
#include <string>
#include <fstream>
using namespace std;
struct travel {
	string route;
	string ship_name;
	string captain_name;
	int price_1;
	int price_2;
	int passengers_1;
	int passengers_2;
	int sold_tickets;
	};

void creating ();
void display ();
void display_tickets ();

	
int main() 
{
cout << "1.Inserting" << endl;
cout << "2.Displaying" << endl;
cout << "3.Displaying (tickets)" << endl;

int choice;
cin >> choice;
switch (choice)
{
case 1: creating();
	
	
}	
	
	
}
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