Empty strings functions

[Kharhamel]

TODO:

• why substr isn't generated?

[codecov-commenter]

Codecov Report

Merging #303 (ae5df91) into master (c1748a0) will decrease coverage by 0.09%.
The diff coverage is 35.29%.

@@             Coverage Diff              @@
##             master     #303      +/-   ##
============================================
- Coverage     48.24%   48.15%   -0.10%     
- Complexity      298      306       +8     
============================================
  Files            16       16              
  Lines           771      785      +14     
============================================
+ Hits            372      378       +6     
- Misses          399      407       +8     

Impacted Files	Coverage Δ
generator/src/Method.php	62.18% <0.00%> (-1.61%)	⬇️
generator/src/Scanner.php	18.18% <0.00%> (-0.34%)	⬇️
generator/src/WritePhpFunction.php	0.00% <0.00%> (ø)
generator/src/DocPage.php	79.33% <66.66%> (-0.81%)	⬇️

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