Thinning out the main GUISLIICE FILE...getting errors when separting things.......

[bostonareahuman]

So I have a bunch of functions in my main GUISLICE.ino and have decided to remove them.
I'm new to C.

Here iss my new changedisplay.h

void fillSettings(int which,  gslc_tsGui * w_Gui);
const char* windgust(double wind, double gust);
const char* humiddw(double temp, double humid);
void setweaimg(int code,const char icon[],gslc_tsElemRef* whichref);
char * direction(int degrees);

and then II made the correspondding C file with the real functions.

I added the new .h to the main file

#include "TFT_eFEX.h"
#include <JPEGDecoder.h>
#include "GUISLICE_GSLC.h"
#include <WiFi.h>
#include "time.h"
#include <ArduinoJson.h>
#include <string.h>
#include <HTTPClient.h>
#include <EEPROM.h>
#include "changedisplay.h"

Now I'm gettting errors sstating that

In file included from sketch/changedisplay.c:1:0:
changedisplay.h:1:21: error: unknown type name 'gslc_tsGui'
void updateSettings(gslc_tsGui * w_Gui);
^

like is no longer part of the program?

So a little C help here.