This question runs in a pre-configured Salesforce environment - no personal connection required.

Write a method that updates all contacts with a specific department name to a new department name. Return the count of updated contacts. If either parameter is null or blank, return 0.

Examples:

Integer count = updateContactDepartments('Sales', 'Revenue');
// Results: 5
// Explanation: Updated 5 contacts from Sales to Revenue department

Integer count = updateContactDepartments('InvalidDept', 'NewDept');
// Results: 0
// Explanation: No contacts found with InvalidDept

Integer count = updateContactDepartments(null, 'NewDept');
// Results: 0
// Explanation: Null input returns 0
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