chore(tests): add unit tests for cmd/template.go, cmd/util.go and cmd/version.go

[Mangaal]

This PR adds unit tests for cmd/template.go, cmd/util.go and cmd/version.go.

Changes Made

• Replaced log.Fatalf with fmt.Fprintf for printing errors to cmd.ErrOrStderr().
• Replaced fmt.Printf with fmt.Fprintf for printing output to cmd.OutOrStdout().

Reason for Changes

The previous implementation used log.Fatalf and fmt.Printf, which made it difficult to capture the command output in unit tests. By using fmt.Fprintf with cmd.ErrOrStderr() and cmd.OutOrStdout(), the output can be directed to buffers, allowing the unit test to capture and verify the output effectively.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 61.82%. Comparing base (80f6c96) to head (d5804df).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #765      +/-   ##
==========================================
+ Coverage   59.98%   61.82%   +1.83%     
==========================================
  Files          31       31              
  Lines        3109     3112       +3     
==========================================
+ Hits         1865     1924      +59     
+ Misses       1100     1044      -56     
  Partials      144      144              

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[jannfis]

Nice, thank you!
LGTM.