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* changeCase now uses converter Dictionary
* If a converter is found, it invokes it
* or else returns null
public string changeCase(string caseType, params string[] words)
// Sanitize the input
caseType = caseType.Trim().ToLower();
// Lookup the converter function in dictonary
ConverterFunction converter;
converters.TryGetValue(caseType, out converter);
if (converter !=null)
return converter(words);
return null;
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