Fix typos and add typos check action.

[ni4]

As title says.

[maxirmx]

I have added empty line at the end of two files

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.71%. Comparing base (78f8dcc) to head (12acef5).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #61   +/-   ##
=======================================
  Coverage   99.71%   99.71%           
=======================================
  Files          10       10           
  Lines         696      696           
=======================================
  Hits          694      694           
  Misses          2        2           

Flag	Coverage Δ
	99.71% <ø> (?)

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[ronaldtse]

Thank you @ni4 @maxirmx !