feat: add user_id index to profiles table for faster lookups

inplace_url.h

@@ -0,0 +1,46 @@
+// Written by retoor@molodetz.nl
+
+// This source code extracts URLs from an input string and replaces them inline with their respective content in Markdown style.
+
+// Imports used: regex.h for regular expression operations, http.h and url.h for HTTP and URL-related utility functions. 
+
+// MIT License
+
+
+#include <regex.h>
+#include "http.h"
+#include "url.h"
+
+void extract_urls(const char *input, char **urls, int *url_count) {
+    const char *pattern = "https?://[^ ]+";
+    regex_t regex;
+    regcomp(&regex, pattern, REG_EXTENDED);
+    regmatch_t match;
+    const char *cursor = input;
+
+    *url_count = 0;
+    while (!regexec(&regex, cursor, 1, &match, 0)) {
+        int length = match.rm_eo - match.rm_so;
+        urls[*url_count] = strndup(cursor + match.rm_so, length);
+        cursor += match.rm_eo;
+        (*url_count)++;
+    }
+
+    regfree(&regex);
+}
+
+void inplace_urls_markdown_style(char *input, char **urls, char **contents, int url_count) {
+    for (int i = 0; i < url_count; i++) {
+        char *found = strstr(input, urls[i]);
+        if (found) {
+            char *new_text = (char *)malloc(strlen(input) + strlen(contents[i]) - strlen(urls[i]) + 1);
+            strncpy(new_text, input, found - input);
+            new_text[found - input] = '\0';
+            strcat(new_text, contents[i]);
+            strcat(new_text, found + strlen(urls[i]));
+
+            free(input);
+            input = new_text;
+        }
+    }
+}