Phonebook in C

Hello guys

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
struct phonebook
{
 char fName[40];
 char lName[40];
 char phone[10];
 struct phonebook *next;
};

struct phonebook *start=NULL;

struct phonebook* getData()
{
 return ((struct phonebook *)malloc(sizeof(struct phonebook)));
}

void insertData()
{
 struct phonebook *temp,*newNode;
 newNode = NULL;
 temp = start;
 newNode = getData();
 printf("\nEnter First Name: ");
 scanf("%s",&newNode->fName);
 printf("Enter Last Name: ");
 scanf("%s",&newNode->lName);
 printf("Enter Phone Number: ");
 scanf("%s",&newNode->phone);
 if(temp == NULL)
 {
  newNode->next = newNode;
  start = newNode;
 }
 else if(strcmp(temp->fName,newNode->fName)>=0)
 {
  while(temp->next != start)
   temp = temp->next;
  temp->next = newNode;
  newNode->next = start;
  start = newNode;
 }
 else
 {
  while(temp->next != start && strcmp(temp->next->fName,newNode->fName)<=0)
   temp = temp->next;
  newNode->next = temp->next;
  temp->next = newNode;
 }
 
 printf("\n");
}

void displayList(struct phonebook *temp)
{
 if(temp == NULL)
  printf("No Content....");
 else
 {
  printf("\nFirst Name \tLast Name \tPhone Number");
  printf("\n----------------------------------------------");
  while(temp->next != start)
  {
   printf("\n%s",temp->fName);
   printf(" \t%s",temp->lName);
   printf(" \t%s",temp->phone);
   temp = temp->next;
  }
  printf("\n%s",temp->fName);
  printf(" \t%s",temp->lName);
  printf(" \t%s",temp->phone);
 }
 printf("\n"); 
}
void copyToFile(struct phonebook *temp)
{
 FILE *fp;
 fp = fopen("PHONEBOOK.txt","w");
 if(fp == NULL)
 {
  printf("\nFile Not Opened");
 }
 else
 {
  if(fp)
   fprintf(fp,"FName,LName,Number\n");
  do
  {
   fprintf(fp,"%s,%s,%s\n",temp->fName,temp->lName,temp->phone);
   temp = temp->next;
  }while(temp != start);
  fclose(fp);
 }
 printf("\n");
}
int main()
{
 int input,i,n,ch;
 do
 {
  printf("\n-------------PHONEBOOK------------");
  printf("\n1.Insert Records");
  printf("\n2.Display Records\n3.END\n");
  printf("\nEnter your choice: ");
  scanf("%d",&input);
  switch(input)
  {
   case 1:
    printf("Enter number of records required: ");
    scanf("%d",&n);
    for(i=1;i<=n;i++)
    {
     printf("\nInsert Data for Record %d",i);
     insertData();
    }
    copyToFile(start);
    displayList(start);
    break;
   case 2:
    displayList(start);
    break;
   case 3:
    printf("PROGRAM ENDS !!!");
    break;
   default:
    printf("Invalid Choice !!!");
  }
  
 }while(input!=3);
 
 printf("\n");
}

/*


-------------PHONEBOOK------------
1.Insert Records
2.Display Records
3.END

Enter your choice: 1
Enter number of records required: 2

Insert Data for Record 1
Enter First Name: renita
Enter Last Name: lobo
Enter Phone Number: 9856856254


Insert Data for Record 2
Enter First Name: gyanendra 
Enter Last Name: maurya
Enter Phone Number: 9878845235



First Name      Last Name       Phone Number
----------------------------------------------
renita       lobo   9856856254
gyanendra    maurya   9878845235

-------------PHONEBOOK------------
1.Insert Records
2.Display Records
3.END

Enter your choice: 2

First Name      Last Name       Phone Number
----------------------------------------------
renita       lobo   9856856254
gyanendra    maurya   9878845235

-------------PHONEBOOK------------
1.Insert Records
2.Display Records
3.END

Enter your choice: 3
PROGRAM ENDS !!!

--------------------------------
Process exited with return value 10
Press any key to continue . . .


*/