PUT

@HttpPut
    global static string putContact(String contactFirstName, String contactLastName) {
        RestRequest req = RestContext.request;
        // Use more meaningful variable names
        String contactId = req.requestURI.substring(req.requestURI.lastindexof('/') + 1);
        
        // Add error handling for query
        Contact con;
        try {
            con = [SELECT Id FROM Contact WHERE Id = :contactId LIMIT 1];
        } catch (Exception e) {
            return 'Error: ' + e.getMessage();
        }
    
        // Update contact fields directly without querying
        con.FirstName = contactFirstName;
        con.LastName = contactLastName;
        update con;
    
        // Return a JSON response instead of a concatenated string
        return JSON.serialize(con);
    }