SebastianG77 / find-duplicated-property-keys / 227

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refactor(index): simplify function formatKey due to reasons listed below:

- even though the old function always returned correct results due to proper input values, the value for variable trimmedKeyOnly has not been assigned in a correct way before
- it is not necessary to transmit the character ':' to the function, as each transmitted string must contain the value due to the corresponding if condition and the character has always been removed anyway
- since the if condition 'if (unformattedTrimmedKey.endsWith(':'))' is unnecessary also the untested false condition is not needed anymore resulting in a higher test coverage without risking further unexpected behavior

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