Automatically change table names when Query is executed

Thank you Jimmy ( v-yuta-msft ) for your interest in helping me. 
I am very new to Power BI and  have probably just created a custom function and therefore not created a real table.
I will try to explain what I have created. 

I have a function called GetData having the following structure; 

let
Source = (datapoint as text) as table =>

    let
    Source = Csv.Document(Web.Contents("www.mydatasource.com/" & datapoint),[Delimiter=",", Encoding=1252, QuoteStyle=QuoteStyle.None])
   in Source

in
Souce

So the function takes datapoint as argument and downloads the content using Web.Contents. 
The result is a table (?) called invoked function and if I rename the table I cant see any code generated in the ''advance editor'' . 

What am I doing wrong ? 

Thanks again