проблемма с оператором return

#include <stdio.h>
#include <string.h>
 
int battle(int player_gold, int player_dmg)
{
    int goblin_gold = 15;
    for(int goblin_hp = 3; ; goblin_hp -= player_dmg)
    {
        if (goblin_hp != 3 && goblin_hp > 0)
            printf("You kick goblin. Goblin HP: %d\n", goblin_hp);
        if (goblin_hp <= 0)
        {
            printf("You dedeat it.\n");
            player_gold += goblin_gold; 
            printf("You found %d You have %d gold total.\n", goblin_gold, player_gold);
            break;
        }
    }
    return player_gold;
}
 
int hello(char *nickname)
{
    char action;
    char sog;
    int c;
    int len;
    while(action != 'Y' || action != 'y')
    {
        
        printf("You'r name?\n");
        fgets(nickname, sizeof(nickname), stdin);
        len = strlen(nickname);
        
        if (nickname[len - 1] == '\n')
            nickname[len - 1] = '\0';
        else
        {
            while((c = getchar() != '\n') && c != EOF)
                ;
        }
        printf("You'r name %s\n", nickname);
        printf("'Y'es or 'N'o.\n");
        action = getchar();
        getchar();
        if (action == 'Y' || action == 'y')
            break;
    }
}
 
int shop(int player_gold, int player_dmg, int protection)
{
    char choice;
    
    
    getchar();
    choice = getchar();
    if(choice == '1' && player_gold >= 100)
    {
        player_gold -= 100;
        protection += 1;
        printf("You'r protection: %d.\n", protection);
    }
    if(choice == '2' && player_gold >= 100)
    {
        player_gold -= 100;
        player_dmg += 1;
        printf("You'r dmg: %d.\n", player_dmg);
    }
    
    
    if(choice == '3')
        printf("Good bye!\n");
    
    getchar();
    return (player_gold, player_dmg, protection);
}
 
int main(void)
{
    
    char nickname[8];
    char action;
    int player_dmg = 1;
    int player_gold = 0;
    int protection = 0;
    
    hello(nickname);
    
    printf("Ok %s, that's over, now for the important stuff.\n", nickname);
    printf("You are a clicker character, your task is to\nbeat the goblin while you are immortal, enjoy\n");
    printf("...\n");
    printf("You attacked by goblin.\n'A'ttack or 'R'un or 'S'hop\n");
    
    action = getchar();
    while (action != 'r' || action != 'R')
    {   
        if(action == 's' || action == 'S')
        {
            char rosch[20] = "===============";
            printf("%s\n", rosch);
            printf("You'r have %d gold\n", player_gold);
            printf("1. Buy sheld -1 goblin dmg (100 gold)\n");
            printf("2. Buy sword +1 hero dmg (100 gold)\n");
            printf("3. Exit from shop.\n");
            printf("%s\n", rosch);
            player_gold = shop(player_gold, player_dmg, protection);
            player_dmg = shop(player_gold, player_dmg, protection);
            protection = shop(player_gold, player_dmg, protection);
            printf("Next action?\n'A'ttack or 'R'un or 'S'hop\n");
            getchar();
            action = getchar();
            
        }
        if (action == 'a' || action == 'A')
        {
            player_gold = battle(player_gold, player_dmg);
            printf("Next action?\n'A'ttack or 'S'hop or 'R'un\n");
            getchar(); // clean buffer
            action = getchar();
        }
    }
    if (action == 'r')
        printf("You've decided to run away! Good bye\n");
    return 0;
}

void shop(int *player_gold, int *player_dmg, int *protection)
{
    char choice;
    
    printf("You have %d gold\n", *player_gold);
    printf("1. Buy shield -1 goblin dmg (100 gold)\n");
    printf("2. Buy sword +1 hero dmg (100 gold)\n");
    printf("3. Exit from shop.\n");
    
    choice = getchar();
    getchar(); // clean buffer
    
    if(choice == '1' && *player_gold >= 100)
    {
        *player_gold -= 100;
        *protection += 1;
        printf("Your protection: %d.\n", *protection);
    }
    if(choice == '2' && *player_gold >= 100)
    {
        *player_gold -= 100;
        *player_dmg += 1;
        printf("Your dmg: %d.\n", *player_dmg);
    }
    if(choice == '3')
        printf("Good bye!\n");
}

if(action == 's' || action == 'S')
{
    shop(&player_gold, &player_dmg, &protection);
    printf("Next action?\n'A'ttack or 'R'un or 'S'hop\n");
    getchar(); // clean buffer
    action = getchar();
}