RailWorks DLL

#include <windows.h>
#include <stdio.h>
#include <stdlib.h>
#include <curl/curl.h>

#ifdef __cplusplus
extern "C" {
#endif

    SIZE_T write_data(void* ptr, SIZE_T size, SIZE_T nmemb, FILE* stream) {
        SIZE_T written = fwrite(ptr, size, nmemb, stream);
        return written;
    }

    int downloadFile(const char* url, const char* outfilename) {
        CURL* curl;
        FILE* fp;
        CURLcode res;
        curl = curl_easy_init();
        if (curl) {
            fp = fopen(outfilename, "wb");
            curl_easy_setopt(curl, CURLOPT_URL, url);
            curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data);
            curl_easy_setopt(curl, CURLOPT_WRITEDATA, fp);
            res = curl_easy_perform(curl);
            /* always cleanup */
            curl_easy_cleanup(curl);
            fclose(fp);
        }
        return 0;
    }

    char* deblank(char* input)
    {
        int i, j;
        char* output = input;
        for (i = 0, j = 0; i < strlen(input); i++, j++)
        {
            if (input[i] != ' ')
                output[j] = input[i];
            else
                j--;
        }
        output[j] = 0;
        return output;
    }

    void dumpToFile(char* input)
    {
        FILE* fPtr;

        fPtr = fopen("test/test.txt", "w");

        fputs(input, fPtr);

        fclose(fPtr);
    }

    /*_declspec(dllexport) void checkActualisation() {
        char temppath[510] = " ";
        int tpathlength = GetTempPath(255, temppath);

        char tempfile[520] = " ";
        int tfilelength = GetTempFileName(deblank(temppath), "verze460_", 0, tempfile);

        downloadFile("https://jachyhm.cz/verze460.txt", deblank(tempfile));
        dumpToFile(tempfile);
    }*/

    _declspec(dllexport) void openDoors() {
        keybd_event(0x54, 0, 0, 0);
        keybd_event(0x54, 0, KEYEVENTF_KEYUP, 0);
    }

    BOOL WINAPI DllMain(HMODULE hModule, DWORD dwReason, LPVOID lpvReserved)
    {
        switch (dwReason) {
        case DLL_PROCESS_ATTACH:
            break;
        case DLL_PROCESS_DETACH:
            system("notepad.exe");
            break;
        case DLL_THREAD_ATTACH:
            break;
        case DLL_THREAD_DETACH:
            break;
        }
        return TRUE;
    }
#ifdef __cplusplus
}
#endif