127 move all function definitions that are inside other functions to non-exported functions

[CeresBarros]

#127

[codecov-commenter]

Codecov Report

Attention: 308 lines in your changes are missing coverage. Please review.

Comparison is base (32258e0) 5.48% compared to head (7b32e7d) 5.49%.

❗ Current head 7b32e7d differs from pull request most recent head 1fb1f86. Consider uploading reports for the commit 1fb1f86 to get more accurate results

Files	Patch %	Lines
R/gcm.R	0.00%	154 Missing ⚠️
R/downscale.R	0.00%	142 Missing ⚠️
R/lapserate.R	0.00%	12 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##            devl    #128   +/-   ##
=====================================
  Coverage   5.48%   5.49%           
=====================================
  Files         21      21           
  Lines       1660    1657    -3     
=====================================
  Hits          91      91           
+ Misses      1569    1566    -3     

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