Extra quotes in split_part macro

[3fonov]

Describe the bug

It seems to be extra quotation in split_part macro. If you run {{ dbt_utils.get_url_parameter("url","field_name") }} it results in following code:

      nullif(
    splitByChar(''&'', 
    splitByChar(''field_name='', url)[2]
)[1]
,'') as field_name,

Steps to reproduce

1. run macro {{ dbt_utils.get_url_parameter("url","field_name") }}

Expected behaviour

I Expect it to be:

      nullif(
    splitByChar('&', 
    splitByChar('field_name=', url)[2]
)[1]
,'') as field_name,