What is Cessna 152 engine cc count?

223 cu. in.

So my calculation says 3511cu. cm

The engine in a Cessna 152 is a Lycoming O-235, so a little larger than 223.

The "O" stands for opposed, referring to the piston layout in a flat 4 configuration, and the 235 is the capacity in cubic inches. This works out to 3850cc.