Restructure DHT22 code, move defines to header, remove redundant includes

DHT22.c

@@ -1,18 +1,8 @@
-#include "config.h"
-
+#include "DHT22.h"
 #include <avr/io.h>
 #include <stdbool.h>
 #include <util/delay.h>
 
-#include "GDM1602K.h"
-
-#define DATAPIN PC0
-#define PORT    PORTC
-#define PIN     PINC
-#define DDR     DDRC
-
-bool is_high() { return (PIN & (1 << DATAPIN)); }
-
 // Function to read data from the DHT22 sensor
 int DHT22_Read(int *temperature, int *humidity) {
     // Set the data pin as output

DHT22.h

@@ -1,7 +1,12 @@
 #ifndef DHT22_H
 #define DHT22_H
 
+#define DATAPIN PC0
+#define PORT    PORTC
+#define PIN     PINC
+#define DDR     DDRC
+
 int  DHT22_Read(int *temperature, int *humidity);
 void DHT22_Init();
 
-#endif /* DHT22_H */
+#endif /* DHT22_H */