fix: refactored scraping components

src/Scraping/Scraping.h

@@ -3,6 +3,7 @@
 
 #include <curl/curl.h>
 #include <libxml/HTMLparser.h>
+#include <libxml/xpath.h>
 
 typedef struct {
   char *url;
@@ -45,6 +46,25 @@ typedef struct {
 extern const SearchEngine ENGINE_REGISTRY[];
 extern const int ENGINE_COUNT;
 
+size_t write_memory_callback(void *contents, size_t size, size_t nmemb,
+                             void *userp);
+const char *get_random_user_agent(void);
+void configure_curl_handle(CURL *curl, const char *full_url,
+                           MemoryBuffer *chunk, struct curl_slist *headers);
+char *build_search_url(const char *base_url, const char *page_param,
+                       int page_multiplier, int page_base,
+                       const char *encoded_query, int page);
+struct curl_slist *build_request_headers(const char *host_header,
+                                         const char *referer);
+void http_delay(void);
+
+xmlXPathContextPtr create_xpath_context(xmlDocPtr doc);
+void free_xpath_objects(xmlXPathContextPtr ctx, xmlXPathObjectPtr obj);
+SearchResult *alloc_results_array(int capacity, int max_results);
+void assign_result(SearchResult *result, char *url, char *title, char *snippet,
+                   int unescape);
+void free_xml_node_list(char *title, char *url, char *snippet);
+
 int scrape_engine(const SearchEngine *engine, const char *query,
                   SearchResult **out_results, int max_results);