string problem when passing in linked list
 

this is my program that have problem when displaying the current data in node, the integer and float data can be view prefectly but the problem at the string data where it not display the data that input but the output is something that like a line that not give any meaning. i hope somebody can help me to solve this problem.
#include<stdio.h>
#include<conio.h>
#include<malloc.h>
#include<stdlib.h>
#define size 15

struct book
{
char bookName[size],authorName[size];
int refNo;
float price;
struct book *next,*prev;
} *head=NULL,*newnode ,*Traverse;

insertData(char[15], char[15] , int, float);
deleteData(char[]);
showData();


main()
{
char book[size],author[size];
char i;
int ref;
float price;

FILE *fpt;
fpt=fopen("book.txt","w");


do{
system("cls");//clrscr()

printf("\t\t-----Welcome To Book Store System-----");

printf("\n\t\t [1] Insert Data");
printf("\n\t\t [2] Delete Data");
printf("\n\t\t [3] Display Information");
printf("\n\t\t [4] Exit System");

printf("\n\t\t Please Enter Your Choice: ");
scanf(" %c",&i);

switch(i)
{
case '1':
printf("Enter Book Name:");
scanf("\n%s",&book[size]);
printf("\nEnter Author Name:");
scanf ("\n%s",&author[size]);
printf("\nEnter Reference Number:");
scanf("\n %d",&ref);
printf("\nEnter Price: RM ");
scanf("\n%f",&price);

insertData(book, author, ref, price);

break;



case '2':
printf("Enter The Book Name You Want To Delete:");
scanf("\n%2s",&book);
deleteData(book);

break;

case '3':
showData();

break;


case '4':
printf("\nThanks You\n");
exit (0);

default:printf("\nInvalid Entry!Please Choose Between 1-4 Only");

getch();

}
}while (i!='4');

return 0;

}





//----------------------------------input data-----------------------------------------------
insertData(char book[size], char author[size], int ref, float price)
{
FILE *fpt;
//open file
fpt=fopen("book.txt","w");

if (head == NULL)
{
newnode = (struct book *)malloc (sizeof(struct book));
newnode -> bookName[size] = book[size];
newnode -> authorName[size] = author[size];
newnode -> refNo = ref;
newnode -> price = price;

newnode -> next = newnode -> prev = NULL;
head = newnode;

//write to file
fprintf(fpt,"\nBook name :%2s",newnode->bookName);
fprintf(fpt,"\nAuthor Name :%2s",newnode->authorName);
fprintf(fpt,"\nReference Number:%d",newnode->refNo);
fprintf(fpt,"\nPrice :RM%.2f",newnode->price);
}

else
{
newnode = (struct book *)malloc (sizeof(struct book));

newnode -> bookName[size] = book[size];
newnode -> authorName[size] = author[size];
newnode -> refNo = ref;
newnode -> price = price;

newnode -> next = newnode -> prev = NULL;

//write to file
fprintf(fpt,"\nBook name :%2s",newnode->bookName);
fprintf(fpt,"\nAuthor Name :%2s",newnode->authorName);
fprintf(fpt,"\nReference Number:%d",newnode->refNo);
fprintf(fpt,"\nPrice :RM%.2f",newnode->price);

Traverse = head;
while(Traverse -> next != NULL)

Traverse = Traverse -> next;

Traverse -> next = newnode;
newnode -> prev = Traverse;
}
fclose(fpt);

return 0;
}

//----------------------------------delete data-----------------------------------------------
deleteData(char book[])
{

Traverse = head;
if(Traverse ->bookName[size] == book[size])
{
head = head -> next;

free(Traverse);

printf("\nRecord Deleted for %2s",book);

}

else
{
while(Traverse -> bookName[size] !=book[size])
Traverse = Traverse -> next;

Traverse -> next -> prev = Traverse -> prev;
Traverse -> prev -> next = Traverse -> next;
free(Traverse);
printf("\nRecord Deleted for %2s",book);
}

getch();
return 0;
}

//----------------------------------display data-----------------------------------------------
showData()
{
Traverse = head;
if(Traverse != NULL){
while (Traverse !=NULL)
{

printf("Book Name :%s\nAuthor Name:%s\nReference Number:%d\nPrice:RM%.2f\n\n",Traverse->bookName,Traverse
->authorName,Traverse->refNo,Traverse->price);

Traverse = Traverse -> next;

}
}

else
{
printf("Sorry No Data To Show");
}

getch();
return 0;
}