Refactor todoitem management: add todolist structure and related functions

src/main.c

@@ -13,7 +13,7 @@ int main(void) {
     puts("Hello, World!");
     setup_appdata();
     printf_s("Appdata path: %s\n", appdata_path());
-    const char *cupath = custom_appdata_path("CustomFolder");
+    const char *cupath = custom_appdata_path("ToDoLists");
     printf_s("Custom appdata path: %s\n", cupath);
     return 0;
 }

src/todoitem.c

@@ -8,7 +8,40 @@ typedef struct {
     int completed;
 } todoitem;
 
- todoitem *create_todoitem(char *name, char *description, int priority, int completed) {
+
+typedef struct {
+    todoitem *items;
+    int count;
+} todolist;
+
+todolist *create_todolist() {
+    todolist *list = malloc(sizeof(todolist));
+    list->items = NULL;
+    list->count = 0;
+    return list;
+}
+
+void tdl_free(todolist *list) {
+    if (list != NULL) {
+        for (int i = 0; i < list->count; i++) {
+            free(list->items[i].name);
+            free(list->items[i].description);
+        }
+        free(list->items);
+        free(list);
+    }
+}
+
+
+void tdl_add_item(todolist *list, char *name, char *description, int priority, int completed) {
+    list->items = realloc(list->items, sizeof(todoitem) * (list->count + 1));
+    list->items[list->count].name = name;
+    list->items[list->count].description = description;
+    list->items[list->count].priority = priority;
+    list->items[list->count].completed = completed;
+    list->count++;
+}
+ todoitem *tdi_new(char *name, char *description, int priority, int completed) {
     todoitem *item = malloc(sizeof(todoitem));
     item->name = name;
     item->description = description;
@@ -17,7 +50,31 @@ typedef struct {
     return item;
 }
 
-void free_todoitem(todoitem *item) {
+void tdl_free(todolist *list) {
+    if (list != NULL) {
+        for (int i = 0; i < list->count; i++) {
+            free(list->items[i].name);
+            free(list->items[i].description);
+        }
+        free(list->items);
+        free(list);
+    }
+}
+
+void tdl_remove_item(todolist *list, int index) {
+    if (index < 0 || index >= list->count) {
+        return; // Invalid index
+    }
+    free(list->items[index].name);
+    free(list->items[index].description);
+    for (int i = index; i < list->count - 1; i++) {
+        list->items[i] = list->items[i + 1];
+    }
+    list->count--;
+    list->items = realloc(list->items, sizeof(todoitem) * list->count);
+}
+
+void tdi_free(todoitem *item) {
     if (item != NULL) {
         free(item->name);
         free(item->description);