refactoring: optimized identity_disconjunctive

src/main/py/logical_operations.py

@@ -1,10 +1,10 @@
-def identity_disconjunctive(variable, operator, zero):
-    if zero == 0 and operator == "+":
-        return variable
-    elif variable == 0 and zero == 1:
-        return 1
-    else:
+def identity_disconjunctive(first_input, operator, second_input):
+    if first_input == 1 and second_input == 1:
         return None
+    elif first_input == 0 and second_input == 0:
+        return 0
+    else:
+        return 1
 
 
 def identity_conjunctive(variable, operator, zero):