fix multi ligne string for lexer. PTGLK !

[Llelepipede]

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[codecov]

Codecov Report

Attention: Patch coverage is 58.33333% with 5 lines in your changes are missing coverage. Please review.

Project coverage is 36.92%. Comparing base (3709243) to head (0b33462).
Report is 2 commits behind head on main.

Files	Patch %	Lines
lexer/lexer.go	58.33%	3 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #287      +/-   ##
==========================================
- Coverage   38.56%   36.92%   -1.64%     
==========================================
  Files          36       39       +3     
  Lines        5334     5587     +253     
==========================================
+ Hits         2057     2063       +6     
- Misses       3049     3296     +247     
  Partials      228      228              

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