Fix typos in comments, variable and function names

[codecov[bot]]

Codecov Report

Merging #473 into master will not change coverage. The diff coverage is 40%.

@@           Coverage Diff           @@
##           master     #473   +/-   ##
=======================================
  Coverage   84.78%   84.78%           
=======================================
  Files         192      192           
  Lines       11939    11939           
=======================================
  Hits        10123    10123           
  Misses       1324     1324           
  Partials      492      492

Impacted Files	Coverage Δ
program/program.go	78.03% <ø> (ø)	:arrow_up:
transpiler/unary.go	75.35% <ø> (ø)	:arrow_up:
types/cast.go	67.76% <ø> (ø)	:arrow_up:
preprocessor/preprocessor.go	82.45% <ø> (ø)	:arrow_up:
util/diff.go	85% <ø> (ø)	:arrow_up:
transpiler/binary.go	68.32% <ø> (ø)	:arrow_up:
program/import.go	100% <ø> (ø)	:arrow_up:
transpiler/operators.go	76.93% <ø> (ø)	:arrow_up:
program/struct.go	72.85% <ø> (ø)	:arrow_up:
util/errors.go	100% <ø> (ø)	:arrow_up:
... and 9 more

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[Konstantin8105]

Thank you.