/in/foo.cc:65:9: error: no declaration matches 'Vector3 Vector3::operator*(const Matrix3&) const'
   65 | Vector3 Vector3::operator*(const Matrix3& matrix)const{
      |         ^~~~~~~
/in/foo.cc:9:13: note: candidate is: 'Vector3 Vector3::operator*(const Vector3&) const'
    9 |     Vector3 operator*(const Vector3& other)const{
      |             ^~~~~~~~
/in/foo.cc:4:7: note: 'class Vector3' defined here
    4 | class Vector3{
      |       ^~~~~~~