Add And Override Functions In Existing Library In Codeigniter

<?php
class My_Table extends CI_Table
{
    public function generateTable()
    {
        echo "This function will only display a message";
    }

}

$this->load->library('table');

$data = array(
array('Name', 'Color', 'Size'),
array('Fred', 'Blue', 'Small'),
array('Mary', 'Red', 'Large'),
array('John', 'Green', 'Medium')
);

echo $this->table->generate($data);

echo $this->table->generateTable();

<?php
class MY_Table extends CI_Table
{
    public function generate($table_data = NULL)
    {
        echo "Calling generate";
    }
}

$this->load->library('table');

$table_data = array(
array('Name', 'Color', 'Size'),
array('Fred', 'Blue', 'Small'),
array('Mary', 'Red', 'Large'),
array('John', 'Green', 'Medium')
);

echo $this->table->generate($table_data);

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