Fixed string formatting styles

[eytanadler]

Purpose

PR #345 added a new feature but combined string formatting styles. This PR changes it to consistently be f strings.

Expected time until merged

Type of change

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (non-backwards-compatible fix or feature)
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no API changes)
• Documentation update
• Maintenance update
• Other (please describe)

Testing

Checklist

• I have run flake8 and black to make sure the Python code adheres to PEP-8 and is consistently formatted
• I have formatted the Fortran code with fprettify or C/C++ code with clang-format as applicable
• I have run unit and regression tests which pass locally with my changes
• I have added new tests that prove my fix is effective or that my feature works
• I have added necessary documentation

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 41.47%. Comparing base (5a8c177) to head (b3ef06f).

Files	Patch %	Lines
adflow/pyADflow.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #347   +/-   ##
=======================================
  Coverage   41.47%   41.47%           
=======================================
  Files          13       13           
  Lines        4068     4068           
=======================================
  Hits         1687     1687           
  Misses       2381     2381           

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[sseraj]

I tested that this still works and added the test