Move split function.

include/wordclock_esp8266.h

@@ -30,7 +30,6 @@ typedef enum
 
 int EEPROM_read_address(int address);
 String leading_zero2digit(int value);
-String split(String s, char parser, int index);
 void check_night_mode(void);
 void EEPROM_write_to_address(int address, int value);
 void handle_button(void);