Use temporary folder for file pp.c. Fixes #244

[Konstantin8105]

See #244

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This change is 

[codecov]

Codecov Report

Merging #247 into master will decrease coverage by 0.02%.
The diff coverage is 60%.

@@            Coverage Diff             @@
##           master     #247      +/-   ##
==========================================
- Coverage   80.79%   80.77%   -0.03%     
==========================================
  Files         134      134              
  Lines        5328     5332       +4     
==========================================
+ Hits         4305     4307       +2     
- Misses        834      835       +1     
- Partials      189      190       +1

Impacted Files	Coverage Δ
main.go	52.6% <60%> (-0.07%)	⬇️

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[elliotchance]

Reviewed 1 of 1 files at r1.
Review status: all files reviewed at latest revision, all discussions resolved.

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