Queue implementatih on with Linked Lists

queueLinked.c

#include <stdio.h>
#include <stdlib.h>
#include <conio.h>

struct node{
    char name[20];
    char secondName[20];
    int age;
    struct node *next;
};

struct node* head = NULL;
struct node* tail = NULL;
struct node* temp;

char firstName[20], secondName[20];
int age;

struct node* createPerson(char name[], char secondName[], int age)
{
    struct node* newPerson = (struct node*)malloc(sizeof(struct node));
    strcpy(newPerson->name, name);
    strcpy(newPerson->secondName, secondName);
    newPerson->age = age;
    newPerson->next = NULL;

    return newPerson;
};

void enQueuePerson(char name[], char secondName[], int age)
{
    struct node* person = createPerson(name, secondName, age);
    if(head == NULL && tail == NULL)
    {
        head = person;
        tail = person;
    }
    else
    {
        tail->next = person;
        tail = person;
    }
}

void deQueue()
{
    temp = head;
    if(head == NULL)
    {
        printf("\nQueue is empty, pls Enqueue");
        return;
    }

    if(head == tail)
    {
        head = NULL;
        tail = NULL;
        return;
    }

    head = temp->next;
    free(temp);
}

struct node* whoNext()
{
    if(head == NULL)
    {
        printf("\nThere is no item in queue...");
        return 0;
    }

    return head;
}

void printQueue()
{
    int i = 1;
    if(head == NULL)
    {
        return;
    }
    temp = head;
    while(temp->next != NULL)
    {
        printf("\n%d. Position => %s %s %d ", i, temp->name, temp->secondName, temp->age);
        temp = temp->next;
        i++;
    }
    printf("\n%d. Position => %s %s %d ", i, temp->name, temp->secondName, temp->age);
}


void menu()
{
    int choise;
    while( 1 == 1 )
    {
        printf("\n 1- Enqueue ... ");
        printf("\n 2- Dequeue ... ");
        printf("\n 3- Who's next? ");
        printf("\nmake your choise ");
        scanf("%d", &choise);
        selection(choise);
    }
}

void selection(int chosen)
{
    switch(chosen)
    {
        case 1:
            printf("\n Enter First Name ... ");
            scanf("%s", &firstName);
            printf("\n Enter Second Name ... ");
            scanf("%s", &secondName);
            printf("\n Enter Age ... ");
            scanf("%d", &age);
            enQueuePerson(firstName, secondName, age);
            printQueue();
            break;
        case 2:
            deQueue();
            printQueue();
            break;
        case 3:
            temp = whoNext();
            printf("\n ****************** \n");
            if(temp != NULL)
            {
                printf("%s %s %d", temp->name, temp->secondName, temp->age);
            }

            break;

    }
}

int main()
{
    menu();
    return 0;
}