Extract initials from a full name. Each initial should be uppercase and separated by a period. If the name is null or empty, return null. Handle multiple spaces between names and ignore extra whitespace.

Examples:

String fullName = 'John Michael Doe';
String initials = extractInitials(fullName);
// Results: 'J.M.D.'
// Explanation: Extract first letter of each word in uppercase

String fullName = 'alice smith';
String initials = extractInitials(fullName);
// Results: 'A.S.'
// Explanation: Converts to uppercase and extracts initials

String fullName = 'Madonna';
String initials = extractInitials(fullName);
// Results: 'M.'
// Explanation: Single name returns single initial

String fullName = '';
String initials = extractInitials(fullName);
// Results: null
// Explanation: Empty name returns null
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