diff --git a/V1/switch.c b/V1/switch.c
index ceab9d4..3af17d7 100644
--- a/V1/switch.c
+++ b/V1/switch.c
@@ -1,18 +1,18 @@
-/* 
+/*
  * switch.c
  * How to register an button and count this
  * author: Simon Wörner, Manuel Vögele,
  * 	   Siegfried Kienzle
  * 24-March-2017
- * 
- * */
+ *  
+ *  */
 
-#define PIN01 ((char *) "1\n")
-#define PIN12 ((char *) "12\n")
-#define PIN11 ((char *) "11\n")
-#define PIN06 ((char *) "6\n")
-#define IN ((char *)"in\n")
-#define OUT ((char *)"out\n")
+#define PIN01 "1\n"
+#define PIN12 "12\n"
+#define PIN11 "11\n"
+#define PIN06 "6\n"
+#define IN "in\n"
+#define OUT "out\n"
 
 #include <stdio.h>
 #include <stdlib.h>
@@ -24,15 +24,13 @@ int reserve(char* gpioPort)
 {
 	int fd;
 	char buffer[2];
-	printf("%s", gpioPort);	
 	strcpy(buffer, gpioPort );
-	
-	if((fd=open("/sys/class/gpio/export", O_RDWR | O_CREAT | O_TRUNC) == -1)) {
+	if((fd=open("/sys/class/gpio/export", O_RDWR | O_CREAT | O_TRUNC)) == -1) {
 		perror(NULL);
 		return EXIT_FAILURE;
 	}
 
-	if(write(fd, &buffer, sizeof(buffer)) == -1) {
+	if((write(fd, &buffer, sizeof(buffer))) == -1) {
 		perror("Cannot write into file");
 		return EXIT_FAILURE;			
 	}