Always copy the original slice to the copy before handling the elements

[urandom]

Walking the slice elements will only produce code that handles non-value
elements. In case the elements contain a mix of pointers and values, not
copying the original items to the sink will result in only pointers
being present in the copy

Fixes #10

[codecov]

Codecov Report

Merging #11 (a8af544) into master (dfdeb68) will increase coverage by 1.36%.
The diff coverage is 100.00%.

❗ Current head a8af544 differs from pull request most recent head 225a4c1. Consider uploading reports for the commit 225a4c1 to get more accurate results

@@            Coverage Diff             @@
##           master      #11      +/-   ##
==========================================
+ Coverage   65.92%   67.28%   +1.36%     
==========================================
  Files           1        1              
  Lines         270      269       -1     
==========================================
+ Hits          178      181       +3     
+ Misses         74       71       -3     
+ Partials       18       17       -1     

Impacted Files	Coverage Δ
main.go	67.28% <100.00%> (+1.36%)	⬆️