Derangements

[FedericoStra]

Add a function to generate all derangements:

julia> map(join, derangements("abbac"))
4-element Vector{String}:
 "baacb"
 "bacba"
 "bcaba"
 "caabb"

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (e6888be) 96.97% compared to head (3e27e3a) 96.98%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #150   +/-   ##
=======================================
  Coverage   96.97%   96.98%           
=======================================
  Files           7        7           
  Lines         728      729    +1     
=======================================
+ Hits          706      707    +1     
  Misses         22       22           

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