diff --git a/cv7/program.c b/cv7/program.c
index ce7a8a8..6261790 100644
--- a/cv7/program.c
+++ b/cv7/program.c
@@ -20,12 +20,12 @@ struct tree* read_tree() {
         return NULL;
     }
     buffer[strcspn(buffer, "\n")] = 0;
-    struct tree* node = calloc(1, sizeof(struct tree));
-    if (buffer[0] == '*') {
-        if (strlen(buffer) <= 1) {
-            error_flag = 1;
-        }
+    
+    if (buffer[0] == '*' && buffer[1] == ' ') {
+        error_flag = 1; // Invalid format if there's a space after '*'
     }
+
+    struct tree* node = calloc(1, sizeof(struct tree));
     strncpy(node->value, buffer, SIZE - 1);
     return node;
 }