split & restruct some files

[codecov[bot]]

Codecov Report

Merging #428 (26d96c4) into master (9017900) will increase coverage by 0.80%. The diff coverage is 24.08%.

:exclamation: Current head 26d96c4 differs from pull request most recent head d3f47ce. Consider uploading reports for the commit d3f47ce to get more accurate results

@@            Coverage Diff             @@
##           master     #428      +/-   ##
==========================================
+ Coverage   47.90%   48.71%   +0.80%     
==========================================
  Files          11       13       +2     
  Lines        2288     2289       +1     
==========================================
+ Hits         1096     1115      +19     
+ Misses       1083     1065      -18     
  Partials      109      109              

Files Changed	Coverage Δ
neighbors.go	10.98% <10.98%> (ø)
backend/file.go	45.23% <45.23%> (ø)
backend/handler.go	51.47% <100.00%> (+2.93%)	:arrow_up:
fs.go	37.09% <100.00%> (+4.84%)	:arrow_up:

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