Clean-up

doitcode/sram.py

diff --git a/doitcode/sram.py b/doitcode/sram.py
index e89f7ab..ef78f77 100644
--- a/doitcode/sram.py
+++ b/doitcode/sram.py
@@ -2,7 +2,7 @@
 from typing import Optional, Tuple, Union, cast
 
 from pdkmaster.technology import geometry as _geo, primitive as _prm
-from pdkmaster.design import circuit as _ckt, library as _lbry
+from pdkmaster.design import library as _lbry
 
 from c4m.pdk import sky130