added feature to compute the hamming distance of a formula

[Shufang-Zhu]

Types of changes

What types of changes does your code introduce? Put an x in all the boxes that apply:

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
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• My change requires a change to the documentation.
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• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov]

Codecov Report

Merging #26 (2056c4d) into develop (d735313) will increase coverage by 0.17%.
The diff coverage is 48.69%.

❗ Current head 2056c4d differs from pull request most recent head 0edd228. Consider uploading reports for the commit 0edd228 to get more accurate results

@@             Coverage Diff             @@
##           develop      #26      +/-   ##
===========================================
+ Coverage    42.05%   42.22%   +0.17%     
===========================================
  Files           64       66       +2     
  Lines         4304     4419     +115     
  Branches      2060     2106      +46     
===========================================
+ Hits          1810     1866      +56     
- Misses         758      774      +16     
- Partials      1736     1779      +43     

Flag	Coverage Δ
cynthia-core	42.22% <48.69%> (+0.17%)	⬆️
cynthia-logic	36.23% <ø> (ø)
cynthia-parser	40.36% <ø> (ø)
cynthia-utils	44.25% <ø> (ø)

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Impacted Files	Coverage Δ
libs/core/tests/unit/test_hamming_distance.cpp	35.08% <35.08%> (ø)
libs/core/src/hamming_distance.cpp	62.06% <62.06%> (ø)

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[marfvr]

Closing in favor of #27