Clean up a sentence by trimming it and reducing every sequence of whitespace characters (spaces, tabs, or newlines) to a single space. Return null when the input is null.

Examples:

String text = '  Salesforce   Apex  Challenge ';
String normalized = normalizeWhitespace(text);
// Results: 'Salesforce Apex Challenge'

String text = 'Lines
with	Tabs';
String normalized = normalizeWhitespace(text);
// Results: 'Lines with Tabs'

Hints:

  • Return null immediately when the input text is null
  • Use String.replaceAll to collapse runs of whitespace characters
  • Call String.trim after the replacement to remove leading and trailing spaces
  • Remember that consecutive whitespace characters include tabs and line breaks
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