fix: possible redefinition of macro and typo

Author: konakona418

include/webui_extensions.h

@@ -24,7 +24,14 @@ extern "C" {
  * - In other cases, as long as the webui.c file is not included directly, 
  *   you might need to define this macro in your compiler settings
  */
-#define WEBUI_EXTENSIONS_API
+#ifndef WEBUI_EXTENSION_API
+#define WEBUI_EXTENSION_API
+#endif
+
+#ifndef WEBUI_EXPORT
+    #define WEBUI_EXPORT
+    #warning "WEBUI_EXPORT not defined; Please include webui.h before webui_extensions.h"
+#endif
 
 #include <stdbool.h>
 #include <stddef.h>
@@ -44,7 +51,7 @@ extern "C" {
  *
  * @example webui_run_fmt(myWindow, "alert('Hello %s');", "World");
  */
-void webui_run_fmt(size_t window, const char* fmt, ...);
+WEBUI_EXPORT void webui_run_fmt(size_t window, const char* fmt, ...);
 
 /**
  * @brief Construct a JavaScript string from a format string,
@@ -68,7 +75,7 @@ void webui_run_fmt(size_t window, const char* fmt, ...);
  * @example bool err = webui_script_fmt(myWindow, 0, myBuffer, myBufferSize,
  *     "return %d + %d;", 4, 6);
  */
-bool webui_script_fmt(size_t window, size_t timeout,
+WEBUI_EXPORT bool webui_script_fmt(size_t window, size_t timeout,
     char* buffer, size_t buffer_length, 
     const char* fmt, ...);