added update user change user and change password

src/db_insert_user.c

@@ -4,14 +4,16 @@
 
 User *db_insert_user(const char *username, const char *email,
                      const char *password, const char *group,
-                     bool *is_superuser) {
+                     const bool *is_superuser) {
   pthread_mutex_lock(&db_mutex);
   if (!db) {
     fprintf(stderr, "Databse not initialized\n");
+    pthread_mutex_unlock(&db_mutex);
     return nullptr;
   }
   if (!username || !email || !password) {
     fprintf(stderr, "username, email, password connot be empty\n");
+    pthread_mutex_unlock(&db_mutex);
     return nullptr;
   }
   const char *sql = nullptr;
@@ -27,6 +29,7 @@ User *db_insert_user(const char *username, const char *email,
   rc = sqlite3_prepare_v2(db, sql, -1, &stmt, 0);
   if (rc != SQLITE_OK) {
     fprintf(stderr, "Cannot prepare statement: %s\n", sqlite3_errmsg(db));
+    pthread_mutex_unlock(&db_mutex);
     return nullptr;
   }
 
@@ -38,13 +41,14 @@ User *db_insert_user(const char *username, const char *email,
     sqlite3_bind_text(stmt, 4, group, -1, SQLITE_STATIC);
   }
   if (is_superuser) {
-    sqlite3_bind_int(stmt, 5, is_superuser);
+    sqlite3_bind_int(stmt, 5, *is_superuser);
   }
 
   rc = sqlite3_step(stmt);
   if (rc != SQLITE_DONE) {
     fprintf(stderr, "Execution failed: %s\n", sqlite3_errmsg(db));
     sqlite3_finalize(stmt);
+    pthread_mutex_unlock(&db_mutex);
     return nullptr;
   }
 
@@ -53,4 +57,7 @@ User *db_insert_user(const char *username, const char *email,
   sqlite3_finalize(stmt);
   printf("User inserted successfully. ID: %d\n", inserted_id);
   pthread_mutex_unlock(&db_mutex);
-}
+  User *new_db_user =
+      new_user(inserted_id, username, email, password, group, is_superuser);
+  return new_db_user;
+}