Separated I/O operations into itemio.c

Signed-off-by: Cestmir Houska <czestmyr@gmail.com>

brmbar.c

@@ -1,21 +1,5 @@
-#include <stdio.h>
 #include "defines.h"
-
-struct item {
-    char ean[EAN_MAXLEN];
-    char name[NAME_MAXLEN];
-    int price;
-} items[ITEM_MAXNUM];
-
-void fill_items()
-{
-    char buf[128];
-    FILE *f = fopen("items.txt", "r");
-    while (fgets(buf, 128, f)) {
-        printf("%s\n", buf);
-   }
-    fclose(f);
-}
+#include "itemio.h"
 
 int main()
 {