How do I make a function for menu 3?

I want to make a function for Menu 3, it said that:
If I choose Next Queue (Menu 3), then:
- Validate if there’s no data, show "There is no queue yet!" message
------------------------------
There is no queue yet!

Press enter to continue.....
------------------------------

- Otherwise, remove the frontmost queue based on its priority and show the data
-----------------------------------------------
The next patient is:
Name        : Mr. Budi
Age         : 34
Description : Serious injury from car accident
Code        : Red

Press enter to continue.....
-----------------------------------------------

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

struct Patient{
 int data;
 int age;
 int prior;
 char name[25];
 char symptoms[50];
 char code[10];
};

struct tnode{
 struct Patient data;
 struct tnode *next;
};

struct tnode *head = NULL, *tail = NULL;

void pushHead(struct Patient data)
{
 struct tnode newPatient = (struct tnode)malloc(sizeof(struct tnode));
 newPatient->data = data;
 newPatient->next = NULL;
 
 if(head == NULL)
 {
  head = newPatient;
 }
 else
 {
  struct tnode *curr = head;
  while(curr->next != NULL)
  {
   curr = curr->next;
  }
  curr->next = newPatient;
 }
}

void pushTail(struct Patient data)
{
 struct tnode newPatient =(struct tnode)malloc(sizeof(struct tnode));
 newPatient->data = data;
 newPatient->next = NULL;
 
 if(head == NULL)
 {
  head = tail = newPatient;
 }
 else
 {
  tail->next = newPatient;
  tail = newPatient;
 }
}

void viewList()
{
 if(head == NULL){
  printf("There is no queue yet!\n");
  return;
 }
 else{
  int i = 1;
  struct tnode *curr = head;
  printf("Patient List\n");
  printf("%-2s | %-25s | %-5s | %-25s | %-10s |\n", "No", "Name", "Age", "Description", "Code");
  while(curr != NULL){
   printf("%-2i | %-25s | %-5d | %-25s | %-10s |\n", i, curr->data.name, curr->data.age, curr->data.symptoms, curr->data.code);
   curr = curr->next;
   i++;
  }
  puts("");
 }

}
void nextQueue()
{
 struct tnode *curr = head;
  while(curr != NULL)
  {
   printf("Name        : %s\n", curr->data.name);
   printf("Age         : %s\n", curr->data.age);
   printf("Description : %s\n", curr->data.symptoms);
   printf("Code        : %s\n", curr->data.code);
   
   curr = curr->next;
  }

 
}
int main()
{
 char name[25];
 int list;
 do
 {
  printf("Bluejack Hospital\n");
  printf("=================\n");
  printf("1. Insert\n");
  printf("2. View\n");
  printf("3. Next Queue\n");
  printf("4. Exit\n");
  printf(">> ");
  scanf("%d", &list);
  struct Patient data;
  switch(list)
  {
   case 1:
    printf("Input patient name: ");
    getchar();
    scanf("%[^\n]", data.name); 
    printf("Input patient age: ");
    scanf("%d", &data.age);
    getchar();
    printf("Input description: ");
    scanf("%[^\n]", data.symptoms);
    getchar();
    printf("Input code(Red/Yellow/Green): ");
    scanf("%s", data.code);
    getchar();
    pushHead(data);
    break;
   case 2: 
    viewList();
    break;
   case 3:
    nextQueue();
    break;
  }
 }
 while(list != 4);
 
 return 0;
}