Fixes for copy and file write

[joaquimg]

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 96.87500% with 1 line in your changes missing coverage. Please review.

Project coverage is 95.22%. Comparing base (275ef07) to head (db64177). Report is 2 commits behind head on master.

Files	Patch %	Lines
src/MOI_wrapper.jl	95.45%	1 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #158      +/-   ##
==========================================
+ Coverage   95.14%   95.22%   +0.07%     
==========================================
  Files           5        5              
  Lines        1010     1026      +16     
==========================================
+ Hits          961      977      +16     
  Misses         49       49              

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