[killer-sudoku-helper] Implementation

[habere-et-dispertire]

See : https://forum.exercism.org/t/new-exercise-contributions/4077

[github-actions]

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[habere-et-dispertire]

template-data.yaml reads :

killer-sudoku-helper( :sum(%s), :size(%s), :exclude%s ),

Should that really not be :

killer-sudoku-helper( :sum(%s), :size(%s), :exclude(%s) ),

?

[m-dango]

template-data.yaml reads :

killer-sudoku-helper( :sum(%s), :size(%s), :exclude%s ),

Should that really not be :

killer-sudoku-helper( :sum(%s), :size(%s), :exclude(%s) ),

?

@habere-et-dispertire No, see the generated test. That placeholder already contains parentheses, and previously the generated test would nest an unnecessary additional pair.