diff --git a/ps3/src/tree.c b/ps3/src/tree.c
index efdd004..d2cb2b0 100644
--- a/ps3/src/tree.c
+++ b/ps3/src/tree.c
@@ -173,7 +173,23 @@ static node_t* simplify_subtree(node_t* node)
   if (node == NULL)
     return node;
 
-  // TODO: Task 1: Implement this function by calling the above functions when applicable
+  for (int i = 0; i < node->n_children; i++) {
+    node_t *child = node->children[i];
+    simplify_subtree(child);
+  }
+
+  switch (node->type) {
+  case OPERATOR:
+    convert_operator(node);
+    break;
+  case PRINTLN_STATEMENT:
+    simplify_println_statement(node);
+    break;
+  case BLOCK:
+    flatten_variable_declarations(node);
+    break;
+  }
+
   return node;
 }