[ianthomas23]

Remove the extra line output after git2cpp checkout -b so that it is

$ git2cpp checkout -b temp
Switched to a new branch 'temp'

rather than

$ git2cpp checkout -b temp
Switched to a new branch 'temp'
Switched to branch 'temp'

It is a one-line fix to return immediately from the checkout subcommand.

Fixes #202.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.35%. Comparing base (162a89a) to head (d5c2419).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #204      +/-   ##
==========================================
- Coverage   88.37%   88.35%   -0.03%     
==========================================
  Files          64       64              
  Lines        3072     3073       +1     
  Branches      376      376              
==========================================
  Hits         2715     2715              
- Misses        357      358       +1     

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