diff --git a/list.c b/list.c
index d7db1e8..42f2c3e 100644
--- a/list.c
+++ b/list.c
@@ -8,4 +8,32 @@ typedef struct Node {
 
 struct List {
     Node *head;
-};
\ No newline at end of file
+};
+
+bool isEmpty(List* list) {
+    return list->head == NULL;
+}
+
+int clear(List* list) {
+    while (!isEmpty(list)) {
+        int errorCode = 0;
+        delete(list, &errorCode);
+    }
+}
+
+int changeNode(List* list, int position, int value) {
+    if (isEmpty(list)) {
+        return -1;
+    }
+
+    Node* walker = list->head;
+    while (walker->position != position) {
+        if (walker->next == NULL) {
+            return -1;
+        }
+        walker = walker->next;
+    }
+
+    walker->value = value;
+    return 0;
+}
\ No newline at end of file