CREATE TABLE table_name_96 (winning_constructor VARCHAR2, date VARCHAR2, circuit VARCHAR2)

Name the Winning constructor on 31 may and a Circuit of madonie?
SELECT winning_constructor FROM table_name_96 WHERE date = "31 may" AND circuit = "madonie"
SELECT "winning_constructor" FROM "table_name_96" WHERE "31 may" = "date" AND "circuit" = "madonie"