Getting to grips with Header and cpp files

Expanding on the Want Cake program I now have them structured into files. Along with more code added:

Showing the files and folders

Now the code is:

main cpp

#include <iostream>
#include <string>
#include <unistd.h>
#include <cstdlib>

#include "functions.h"

using namespace std;

int main()

  string cake, pieces, drink;
  cake = get_cake();
  pieces = get_pieces();
  drink = get_drink();
  cout << " You ordered " << cake << " At " << pieces << " pieces of cake and a drink of " << drink << "\n";
//System Command that won't be staying I only added this until I learn  an alternative 
  sleep (3); 
  goto cake;
          return 0;

cake cpp

#include <iostream>
#include <string>
#include <unistd.h>
#include <cstdlib>

using namespace std;

std::string get_cake() {
  std::string cake;
  cout << "Hello and welcome to the cake shop - What type of cake do you want? ";
  getline (cin, cake);
  cout << cake << " Great Choice! \n";

  return cake;

void say_thankyou() {
  cout << "Thank you for shopping at The Cake Shop... Have a great day.... \n";
  cout << "Next customer please! \n";
  //sleep (3); 

Drink cpp

#include <cstdlib>
#include <iostream>

using namespace std;

std::string get_drink() {
  std::string drink;
  cout << "What drink do you want? ";
  getline (cin, drink);
  cout << "You now have a " << drink << " aswell\n";
  return drink;


#include <cstdlib>
#include <iostream>

using namespace std;
std::string get_pieces() {
  std::string pieces; 
  cout << "How many pieces of cake do you want? ";
  getline (cin, pieces);
  cout <<"You now have " << pieces << " Pieces of Cake .\n";
  return pieces;



#include <iostream>

std::string get_cake();
std::string get_pieces();
std::string get_drink();
void say_thankyou();

#endif /* FUNCTIONS_H */

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