rename (internal) function format to fmt

[eddelbuettel]

No description provided.

[codecov]

Codecov Report

Merging #104 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master   #104   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           5      5           
  Lines         246    246           
=====================================
  Hits          246    246

Impacted Files	Coverage Δ
src/anytime.cpp	100% <100%> (ø)	⬆️

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