made work: removeAtIndex(x);

src/list.c

@@ -214,3 +214,12 @@ listInsertAt(list_t* l, int index, dataType_e type, void* element) {
         }
     }
 }
+
+void
+listRemoveAt(list_t* l, int index) {
+    vectorRemoveAt(l->data, index);
+    l->size -= 1;
+    if (l->size == l->capacity) {
+        l->capacity /= 2;
+    }
+}