old_contents: from distutils.core import setup
  from distutils.extensions import Extension
  from Cython.build import cythonize
  
  setup(
      ext_modules=cythonize([
          Extension("uci", ["uci.pyx"],
                    libraries=["uci"])])
  )
  
new_contents: from distutils.core import setup
  from distutils.extension import Extension
  from Cython.Build import cythonize
  
  setup(
      ext_modules=cythonize([
          Extension("uci", ["uci.pyx"],
                    libraries=["uci"])])
  )
  
subject: fix setup.py typos