Refactor _set_to_multihot

[sepandhaghighi]

Reference Issues/PRs

What does this implement/fix? Explain your changes.

• _set_to_multihot function updated

Any other comments?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.38%. Comparing base (b7a480c) to head (d36b561).

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #670      +/-   ##
==========================================
- Coverage   99.38%   99.38%   -0.00%     
==========================================
  Files          15       15              
  Lines        3384     3380       -4     
  Branches      460      458       -2     
==========================================
- Hits         3363     3359       -4     
  Misses         15       15              
  Partials        6        6              

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