1069 automatic diff failure partly meta issue

[similato87]

Removed Line Numbers in Text Output & Changes Validation Bug Fix

Following the guidance provided by @ATheorell and the discussions in issue #1069, I have made the necessary updates to the text output. This includes the removal of line numbers from the print output, which aligns with the consensus for a cleaner and more user-friendly display. Additionally, I have corrected the changes validation function in improve function.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.45%. Comparing base (a8b82d1) to head (5d9782b).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1074      +/-   ##
==========================================
+ Coverage   84.13%   84.45%   +0.32%     
==========================================
  Files          26       26              
  Lines        1393     1396       +3     
==========================================
+ Hits         1172     1179       +7     
+ Misses        221      217       -4     

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[akaihola]

I can confirm that this PR fixes the problem I reported in #1073. I now get the Do you want to apply these changes? [y/N] prompt again.