Ok added insert, need test for that and add type restrictions with cpp Concepts (HATE that name)

include/linkedlist.h

@@ -107,6 +107,15 @@ public:
      */
     LinkedListErr set(size_t index, const T& value);
 
+    /**
+     * @brief Inserta un valor en el index dado.
+     *
+     * @param index Indice del elemento
+     * @param value Nuevo valor
+     * @return LinkedListErr Codigo de estado
+     */
+    LinkedListErr insert (size_t index, const T& value);
+
     /**
      * @brief Busca un valor dentro de la lista
      * 
@@ -192,6 +201,46 @@ LinkedListErr LinkedList<T>::set(size_t index, const T& val) {
     return LinkedListErr::LINKEDLIST_OK;
 }
 
+template <typename T>
+LinkedListErr LinkedList<T>::insert(size_t index, const T& value) {
+    if (this->is_empty()) {
+        return this->append(value);
+    }
+
+    if (index >= this->size) {
+        return LinkedListErr::LINKEDLIST_OUT_OF_BOUNDS;
+    }
+
+    // If index is head
+    if (index == 0) {
+        return this->prepend(value);
+    }
+
+    // If index is tail
+    if (index == this->size - 1) {
+        return this->append(value);
+    }
+
+    Node<T> *current = this->head;
+    for (size_t i = 1; i < index; i++) {
+        current = current->next;
+    }
+
+    Node<T> *new_node = nullptr;
+
+    try {
+        new_node = new Node<T>;
+    } catch(const std::bad_alloc&) {
+        return LinkedListErr::LINKEDLIST_BAD_ALLOC;
+    }
+
+    new_node->data = value;
+    new_node->next = current->next->next;
+    current->next = new_node;
+
+    return LinkedListErr::LINKEDLIST_OK;
+}
+
 template <typename T>
 LinkedListErr LinkedList<T>::append(const T& value) {
     Node<T> *new_node = nullptr;