cBKTree does not compile

[sc07kvm]

cBKTree version: 0.3.2
OS: Windows and Linux
Python: 3.9

python setup.py build
[1/1] Cythonizing lib/cyHamDb.pyx

Error compiling Cython file:
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...

^
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lib/cyHamDb.pyx:1:0: 'cbktree/cyHamDb' is not a valid module name
Traceback (most recent call last):
  File "/home/user/cBKTree/setup.py", line 23, in <module>
    ext_modules=cythonize([Extension(
  File "/home/user/.pyenv/versions/3.9.7/lib/python3.9/site-packages/Cython/Build/Dependencies.py", line 1102, in cythonize
    cythonize_one(*args)
  File "/home/user/.pyenv/versions/3.9.7/lib/python3.9/site-packages/Cython/Build/Dependencies.py", line 1225, in cythonize_one
    raise CompileError(None, pyx_file)
Cython.Compiler.Errors.CompileError: lib/cyHamDb.pyx

Fix:
Need to change the module name "cbktree/cyHamDb" to "cbktree.cyHamDb"