I have attempted to piece together a VF Log a Call page but I am having trouble populating the VF page with an Account values while using the ApexPages.currentPage().getParameters().get('custom-field-goes-here'); None of the fields populate. I am I mssing something??

ControllerExtenstion

public with sharing class LogACallControllerExtension {

    public Task task {get; set;}

    public LogACallControllerExtension(ApexPages.StandardController controller) {
            this.task = (Task)controller.getRecord();
            this.task.whatId = ApexPages.currentPage().getParameters().get('what_id'); 
            this.task.AMarket_Segment__c = ApexPages.currentPage().getParameters().get('Market_Segment_Copy__c');    
            this.task.subject = 'Outside Sales Call'; 
            this.task.type = 'Call';
            this.task.status = 'Completed';
            this.task.activitydate = Date.today();
    }
    
    
}

Visualforce Page

<apex:page standardController="Task" extensions="LogACallControllerExtension" docType="html-5.0" showHeader="false" standardStylesheets="false">


<div class="bootstrap" columns="1">
<apex:form >
   <div>
           <label>Related To</label><br />
            <apex:inputField style="form-control" value="{!Task.WhatId}" /><br /><br />
            
            </div>
            
            <label>Market Segment</label><br />
            <apex:inputField value="{!Task.AMarket_Segment__c }" /><br /><br />
            
            <label>Classification</label><br />
            <apex:inputField value="{!Task.Classification__c}" /><br /><br />
            
            <label>Call Type</label><br />
            <apex:inputField value="{!Task.Call_Type__c}" /><br /><br />
            
            <label>Sales Objective</label><br />
            <apex:inputField value="{!Task.All_Communities_Objective__c}" /><br /><br />
            
            <label>Accomplished</label><br />
            <apex:inputField style="form-control" value="{!Task.Accomplished__c}" />  <br/><br />
            
            <label>Next Steps</label><br />
            <apex:inputField style="form-control" value="{!Task.Next_Steps__c}" /><br /><br/>
            
            <label>Relevant Notes</label><br />
            <apex:inputField value="{!Task.Relevant_Notes__c}" /><br /><br />
            
<div id="formControls" >
<apex:commandButton action="{!quickSave}" value="Save"/>  </div>  
</apex:form>
</div>
</body>
</apex:page>