sc_buf_shrink, sc_list del before add.

[tezc]

fixes #61
fixes #60

[codecov]

Codecov Report

Merging #62 (d233d5a) into master (8c5b16e) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master      #62   +/-   ##
=======================================
  Coverage   99.82%   99.82%           
=======================================
  Files          23       23           
  Lines        2256     2270   +14     
  Branches      398      401    +3     
=======================================
+ Hits         2252     2266   +14     
  Partials        4        4           

Impacted Files	Coverage Δ
buffer/sc_buf.h	100.00% <ø> (ø)
buffer/sc_buf.c	100.00% <100.00%> (ø)
linked-list/sc_list.c	100.00% <100.00%> (ø)

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