Remove string interpolation in show

[devmotion]

See https://docs.julialang.org/en/v1/manual/performance-tips/#Avoid-string-interpolation-for-I/O.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.47%. Comparing base (0479a8a) to head (07c51fa).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #40      +/-   ##
==========================================
+ Coverage   86.84%   89.47%   +2.63%     
==========================================
  Files           1        1              
  Lines          76       76              
==========================================
+ Hits           66       68       +2     
+ Misses         10        8       -2     

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