Anonymous Rest API using Force.com Salesforce

Apex :

@RestResource(urlMapping = '/agentInfor/*')
global class AgentInformationCls {
    @HttpGet
    global static List < InboundAgentInfomation > getAgentInfomation() {
        List < InboundAgentInfomation > agentInfo = new List < InboundAgentInfomation > ();
       
        RestRequest req = RestContext.request;
        String agentEmailAddress = req.params.get('emailId');
        String primarySkill = req.params.get('primarySkill');
        String secondarySkill = req.params.get('secondarySkill');
        String firstName = req.params.get('firstName');
        String lastName = req.params.get('lastName');
        String locationName = req.params.get('locationName');
       
        try {
            //dynamic query formation
            String wherequery = 'select  id, Client__c, Confirm_Password1__c, Contact__c, Email_Address__c, Experience_in_Primary_Skill__c,'
            +' Experience_in_Secondary_Skill__c, First_Name__c, Last_Name__c, Location__c, Password1__c, Primary_Skill__c, Secondary_Skill__c,'
            +'Primar_Skill_Proficiency1__c, Secondary_Skill_Proficiency1__c, Career_Level__c from Base_Data__c  where (';
            if (String.isNotBlank(agentEmailAddress)) {
                wherequery = wherequery + 'Email_Address__c = \'' + agentEmailAddress + '\'' + ' and ';
            }
            if (String.isNotBlank(primarySkill)) {
                wherequery = wherequery + 'Primary_Skill__c= \'' + primarySkill + '\'' + ' and ';
            }
            if (String.isNotBlank(secondarySkill)) {
                wherequery = wherequery + 'Secondary_Skill__c = \'' + secondarySkill + '\'' + ' and ';
            }
            if (String.isNotBlank(firstName)) {
                wherequery = wherequery + 'First_Name__c = \'' + firstName + '\'' + ' and ';
            }
            if (String.isNotBlank(lastName)) {
                wherequery = wherequery + 'Last_Name__c = \'' + lastName + '\'' + ' and ';
            }
            if (String.isNotBlank(locationName)) {
                wherequery = wherequery + 'Location__c = \'' + locationName + '\'' + ' and ';
            }
            if (wherequery.substring(wherequery.length() - 4) == 'and ') {
                wherequery = wherequery.substring(0, wherequery.length() - 4);
            }
           
            wherequery = wherequery + ') order by Primar_Skill_Proficiency1__c desc';
            system.debug(wherequery);
            //Adding dynamic query to list
            List < Base_Data__c > acc = Database.query(wherequery);
            if (!acc.isEmpty()) {
                for (Base_Data__c b: acc) {
                    agentInfo.add(new InboundAgentInfomation(b, acc.size()));
                }
                return agentInfo;
            } else {
                agentInfo.add(new InboundAgentInfomation('No Results Found'));
                return agentInfo;
            }
        } catch (exception e) {
            agentInfo.add(new InboundAgentInfomation(e.getMessage()));
            return agentInfo;
        }

    }
    global class InboundAgentInfomation {
        global Integer recordCount;
        global Base_Data__c agentList;
        global String errorMessage;

        global InboundAgentInfomation(Base_Data__c agentList, Integer recordCount) {
            this.agentList = agentList;
            this.recordCount = recordCount;
        }
        global InboundAgentInfomation(String errorMessage) {
            this.errorMessage = errorMessage;
            this.agentList = agentList;
            this.recordCount = 0;
        }
    }
}