problem printf after inserting single list from file

hi everyone
i am writing a book datzabase(my first)

the trouble is when i want to check if the funcition finds the same isbn number it wrecks my linked list
an example

org isbn 1-234-56789-0

i want to make 1234567890 when i use input directly from the keyboard no problem
but when i read the isbn-number from a file
i get instead of 1-234-56789-0
becomming 123456789! my last number is changed into a exclamtion point
any one got any ideas here is the code[

Code:

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

#define BUFSIZE 80

struct dbline{
	char author[BUFSIZE];
	char title[BUFSIZE];
	char edition[BUFSIZE];
	char isbn[15];
	char publisher[BUFSIZE];
	char comment[BUFSIZE];
       	struct dbline *next_rec;
};

typedef struct dbline LIST;
typedef LIST *LINK;

void clear_kb(void)
{
	char junk[BUFSIZE];
	fgets(junk,BUFSIZE,stdin);
}
LINK search_isbn(LINK first)
{
	LINK tmp_rec = NULL;
	LINK cur_rec = NULL;
	LINK head = NULL;
	char *p;
	char ch;
	char *search_buf;
	char *search_buf1;
	char *tmp_buf;
	char *tmp_buf1;
	long fin_isbn_num;
	long fin_isbn_tmp;
	int i = 0;
	int ii = 0;
	search_buf = (char *) malloc(15 * sizeof(char));
	search_buf1 = (char *) malloc(12 * sizeof(char));
	tmp_buf = (char *) malloc(15 * sizeof(char));
	tmp_buf1 = (char *) malloc(12 * sizeof(char));
	puts("Enter the isbn number that you want to search");
	fgets(search_buf,16,stdin);
/*	p = strchr(search_buf,'\n');
		if ( p != NULL)
			*p = '\0';*/
	clear_kb();
	cur_rec = first;
	while(search_buf[i] != '\n')
	{
			ch = search_buf[i];	
			if(search_buf[i++] != '-')
			{	
				search_buf1[ii++] = ch;
			}
	}
	printf("%s\n", search_buf1);
	puts("\n");
	while (cur_rec != NULL)
	{
	printf("%s\n", cur_rec->isbn);
	puts("\n");

		i = 0;
		ii = 0;
		strcpy(tmp_buf,cur_rec->isbn);
		while(tmp_buf[i] != '\n')
		{
			ch = tmp_buf[i];	
			if(tmp_buf[i++] != '-')
			{	
				tmp_buf1[ii++] = ch;
			}
		}
		printf("%s\n", tmp_buf1);
		fin_isbn_num = atol(search_buf1);
		fin_isbn_tmp = atol(tmp_buf1);

		printf("%ld\n", fin_isbn_num);
		printf("%ld\n", fin_isbn_tmp);


		if(fin_isbn_num == fin_isbn_tmp) 
		{
			if(head == NULL)
			{
				tmp_rec = cur_rec;
				head = tmp_rec;
			}
		}
		cur_rec = cur_rec->next_rec;
	}
	return head;
}
FILE *open_file_to_read(FILE *fp ,char *filename)
{
	if((fp = fopen(filename ,"r")) == NULL)
	{
		fprintf(stderr ,"error opening file");
		exit(-1);
	}
	return fp;
}

LINK read_to_list(FILE *fpr, LINK first)
{
	LIST tmp_rec ;
	LINK new_rec = NULL; 
	LINK cur_rec = NULL;
	while(fgets(tmp_rec.author, BUFSIZE, fpr) && fgets(tmp_rec.title, BUFSIZE, fpr) && fgets(tmp_rec.edition, BUFSIZE, fpr) && fgets(tmp_rec.isbn, BUFSIZE, fpr) && fgets(tmp_rec.publisher, BUFSIZE, fpr) && fgets(tmp_rec.comment, BUFSIZE, fpr) != NULL)
	{
		new_rec = (LINK) malloc(sizeof(LIST));
		*new_rec = tmp_rec;
		if (cur_rec == NULL)
		{
			cur_rec = new_rec;
			first = new_rec;
		}
		else
		{
			cur_rec->next_rec = new_rec;
			cur_rec=new_rec;
		}
		
		new_rec->next_rec = NULL;
	}
	printf("%s", first->author);
	return first;
}

void print_all(LINK first)
{
	LINK cur_rec = NULL;
	cur_rec = first;
	while (cur_rec != NULL)
	{	
		printf("\nauthor:	%s", cur_rec->author);
		printf("\ntitle:	%s", cur_rec->title);
		printf("\nedition:	%s", cur_rec->edition);
		printf("\nisbn:		%s", cur_rec->isbn);
		printf("\npublisher:	%s", cur_rec->publisher);
		printf("\ncomment:	%s", cur_rec->comment);
		cur_rec = cur_rec->next_rec;
	}
}
int menu_search(void)
{
	int answer;
	puts("1:Author");
	puts("2:Title");
	puts("3:Isbn");
	puts("4:Publisher");
	puts("5:Comment");
	scanf("%d", &answer); /*veranderen in short*/
	clear_kb();
	return answer;
}
char menu(void)
{
	char answer;
	puts("New : n");
	puts("Add new line: a");
	puts("Modifya new line: m");
	puts("Delete: d");
	puts("Print: p");
	puts("Quit: q");
	scanf("%c", &answer);
	clear_kb();
	return answer;	
}

int main (void)
{	
	LINK first = NULL;
	LINK new_rec = NULL;
	new_rec = (LINK)malloc(sizeof(LIST));
	char answer_m;
	char filename[BUFSIZE];
	char *p;
	FILE *fp ;
	FILE *fpr;
	int answer_search = 0;
	if(!new_rec)
	{
		printf("\nUnable to alloctte memory!\n");
		exit(1);
	}
	answer_m = menu();
	switch(answer_m)
	{
		case 'p':
		{
			puts("Enter the filename:");
			fgets(filename,BUFSIZE,stdin);
			p = strchr(filename,'\n');
			if ( p != NULL)
				*p = '\0';
			clear_kb();
			fpr = open_file_to_read(fp, filename);
	first = read_to_list(fpr, first);
			fclose(fpr);
			while(1)
			{
				answer_search = menu_search();
				switch(answer_search)
				{
				case 3:
				{
					first = search_isbn(first);
					print_all(first);
					exit(-1);	
		 		}
				}
			}
			break;
		}
		case 'q':
		{
			exit(1);
		}
	}
		return 0;
}

thanks in advance

i think i got thank you for your advice

Code:

void strip_string(char *strip_buf)
{
	char tmp_buf[12];
	int i = 0;	
	int ii = 0;
	char ch;
	printf("%s", strip_buf);
	while(strip_buf[i++] != '\n')
	{
		ch = strip_buf[i];
		if ( ch != '-' )
		{
			tmp_buf[ii++] = ch;	
		}
	}
	tmp_buf[ii] = '\0';

}	
	
		 	

LINK search_isbn(LINK first)
{
	LINK tmp_rec = NULL;
	LINK prev_rec = NULL;
	LINK cur_rec = NULL;
	LINK head = NULL;
	char *p;
	char search_buf[15];
	char tmp_buf[15];
	puts("Enter the isbn number that you want to search");
	fgets(search_buf,15,stdin);
	clear_kb();
	cur_rec = first;
	printf("%s\n" ,search_buf);
	strip_string(search_buf);	
	printf("%s\n" ,search_buf);
	while (cur_rec != NULL)
	{

		strcpy(tmp_buf,cur_rec->isbn);
		strip_string(tmp_buf);	
		if (strcmp(tmp_buf,search_buf) == 0)
		{
			tmp_rec = (LINK) malloc(sizeof(LIST));
			*tmp_rec = * cur_rec;	
			if(head == NULL)
			{
			prev_rec = tmp_rec;
			head = tmp_rec;
			}
			else
			{
			prev_rec->next_rec = tmp_rec;
			prev_rec = tmp_rec;
			}
		tmp_rec->next_rec = NULL;		
		}	
		cur_rec = cur_rec->next_rec;
	}
	return head;
}

thx again for your reply
but i don't get
sopy like strcpy
or returning from the function but when i try to assign
it to a new string my compiler says
incompatible types in assignment
i don't ubderstand it i think

thx again for your advice