Add: Find Common Characters

[awesee]

No description provided.

[codecov-io]

Codecov Report

Merging #426 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master   #426   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files         154    155    +1     
  Lines        1530   1547   +17     
=====================================
+ Hits         1530   1547   +17

Impacted Files	Coverage Δ
...s/find-common-characters/find_common_characters.go	100% <100%> (ø)

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