Refactor code to avoid out of bounds operation after deflation

[andreasnoack]

Closes #121

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (8414b44) 95.94% compared to head (4e1dc1d) 95.95%.

❗ Current head 4e1dc1d differs from pull request most recent head a3d7c17. Consider uploading reports for the commit a3d7c17 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #122   +/-   ##
=======================================
  Coverage   95.94%   95.95%           
=======================================
  Files          11       11           
  Lines        1626     1630    +4     
=======================================
+ Hits         1560     1564    +4     
  Misses         66       66           

Impacted Files	Coverage Δ
src/svd.jl	97.38% <100.00%> (+0.03%)	⬆️

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