step4: add smiles

[sdzhong]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 87.50000% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 97.82%. Comparing base (5e6f5cc) to head (482e913).

Files	Patch %	Lines
api/smiles/smiles.py	80.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##              main       #5      +/-   ##
===========================================
- Coverage   100.00%   97.82%   -2.18%     
===========================================
  Files            2        4       +2     
  Lines           38       46       +8     
===========================================
+ Hits            38       45       +7     
- Misses           0        1       +1     

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[sdzhong]

Bug codecov/worker#393

The tutorial says, "Notice that we have the two files api/smiles/smiles.py and api/smiles/test_smiles.py in our Impacted Files list."
Expected behavior: I see 2 files, smiles.py and test_smiles.py listed.
Observed behavior: I see only 1 file, smiles.py, listed. The Files Changed includes new file test_smiles.py as created in 4a.