escape strings

[DvirDukhan]

fix issue #51

[codecov]

Codecov Report

Merging #52 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #52   +/-   ##
=======================================
  Coverage   90.56%   90.56%           
=======================================
  Files           6        6           
  Lines         106      106           
  Branches        6        6           
=======================================
  Hits           96       96           
  Misses         10       10           

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