Double print

this thing seems to run twice? does anyone see why? I dont want the zeros at the end

i use the data file

a e i o u A E I O U


help!

Code:

---

____________________my.h_________________________
#include <stdio.h>
#include <stdlib.h>

typedef int CNT;
typedef char DATA;
typedef struct TAG
{
        DATA data;
        struct TAG* link;
}NODE;

int main(void);
void makelist(NODE*, NODE*);
void displist(NODE*, NODE*);
CNT vowel(NODE*);
CNT xs(NODE*);
void list(NODE*);

______________________main_____________________

#include "my.h"

int main(void)
{

        NODE* List= NULL;
        NODE* Ulist = NULL;
        makelist ( List, Ulist);
        displist ( List, Ulist);

        return 0;
}



____________________makelist_____________________

#include "my.h"

void makelist(NODE* a, NODE* b)
{

        //local declarations
        NODE* now;
        DATA file;

        //statements
        while(1)

 {
                scanf("%c", &file);
                if(file == '\n')        break;
                now = malloc(sizeof(NODE));
                (*now).data = file;
                (*now).link = a;
                a = now;


       
                if((file == 'A')|| (file == 'B')|| (file == 'C')|| (file
== 'D')|| (file == 'E')||
                  (file == 'F')|| (file == 'G')|| (file == 'H')|| (file
== 'I')|| (file == 'J')||
                  (file == 'K')|| (file == 'L')|| (file == 'M')|| (file
== 'N')|| (file == 'O')||
                  (file == 'P')|| (file == 'Q')|| (file == 'R')|| (file
== 'S')|| (file == 'T')||
                  (file == 'U')|| (file == 'V')|| (file == 'W')|| (file
== 'X')|| (file == 'Y')||
                  (file == 'Z'))
                {

       
                        now = malloc(sizeof(NODE));
                        (*now).data = file;
                        (*now).link = b;
                        b = now;
                }

}//while
displist(a,b);
                 
        return;
}

 ____________________________displist___________________


#include "my.h"

void displist(NODE* a, NODE* b)
{

printf("\n\n\n");
list(a);
printf("\n");
list(b);
printf("\n");
printf("Total number of vowels: %3d\n", vowel(a));
printf("Total number of Xs:    %3d\n", xs(b));
printf("\n\n\n");

return;
}




_________________vowel_______________


#include "my.h"

CNT vowel(NODE* a)
{

        //local variables
        CNT vowels = 0;
        NODE* now = a;

        //statements
        while( now != NULL)
{
                if(((*now).data == 'a')|| ((*now).data == 'A')||
((*now).data == 'e')|| ((*now).data == 'E')||
                  ((*now).data == 'i')|| ((*now).data == 'I')||
((*now).data == 'o')|| ((*now).data == 'O')||
                  ((*now).data == 'u')|| ((*now).data == 'U'))
                        vowels++;
                now = (*now).link;
}

        return vowels;
}



_____________________xs.c_______________

#include "my.h"

CNT xs(NODE* a)

{

        //local variables
        CNT Xs = 0;
        NODE* now = a;

        //statements
        while(now != NULL)
        {
                if(((*now).data == 'X'))
                        Xs++;
                now = (*now).link;
        }

        return Xs;
}



_______________list_______________

#include "my.h"

void list(NODE* a)
{

        //locla variables
        NODE* now=a;

        //statements
        while(now != NULL)
        {
                printf("%c",(*now).data);
                now = (*now).link;
        }

        return;
}

---

output

U O I E A u o i e a
UOIEA
Total number of vowels: 10
Total number of Xs: 0








Total number of vowels: 0
Total number of Xs: 0

Well, look at your function calls:
main calls: makelist, displist
makelist calls: displist
Looks like displist gets called twice....