我在 C 中不断收到错误LNK2019或未解决的外部符号错误，但看不出原因

问：

我收到错误未解决的外部符号_applicationStartup函数 main 中引用。我正确声明和定义了函数，但它一直给出错误。这些是代码的主要部分，所有内容都存储并保存在同一个文件中。

#include <stdio.h>
#include "accountTicketingUI.h"

#define ACCOUNT_SIZE 50
#define TICKET_SIZE 50

void populateAccounts(struct Account accounts[], int arrSize);
void populateTickets(struct Ticket tickets[], int arrSize);

int main(void)
{
 
    struct Account accounts[ACCOUNT_SIZE] = { {0} };
   
    struct Ticket tickets[TICKET_SIZE] = { {0} };

    struct AccountTicketingData data = { accounts, ACCOUNT_SIZE, tickets, TICKET_SIZE };

    populateAccounts(data.accounts, data.ACCOUNT_MAX_SIZE);

    populateTickets(data.tickets, data.TICKET_MAX_SIZE);

  
    applicationStartup(&data);

    return 0;
}

在 accountTicketingUI.h 中，我首先声明应用程序启动。

#include <stdio.h>
#include "account.h"
#include "ticket.h"





void applicationStartup(struct AccountTicketingData*);//starting function to call everything


void pauseExecution(void);//pause function
int displayAccountDetailHeader();//displays the header 
int displayAccountDeatailRecord(struct Account *);//function to display records

int menuLogin(const struct Account accounts[], int max);//login function
int menuAgent(struct AccountTicketingData*, const int ptr);//menu for the user

int displayAllAccountDetailRecords(const struct Account accounts[], int max);//displas everything an encrypts it

int findAccountIndexByAcctNum(int num, const struct Account accounts[], int max, int prompt);

struct AccountTicketingData
{
    struct Account* accounts;
    const int ACCOUNT_MAX_SIZE;
    struct Ticket* tickets;
    const int TICKET_MAX_SIZE;
};

这是应用程序启动的实际代码

void applicationStartup(struct AccountTicketingData *accounts[]) 
{
    int index;//loops and index holders

    while (1)
    {
        index = menuLogin(accounts, ACCOUNT_MAX_SIZE); 

        if (index != -1)
        {
            menuAgent(accounts, ACCOUNT_MAX_SIZE, index); 
        }
        else {
            break;
        }

    }
    printf("==============================================\n");
    printf("Account Ticketing System - Terminated\n");
    printf("==============================================\n\n");
}