resolves #959

Problem

The comment contains trailing whitespaces. The macro statements also generate trailing whitespaces, which fails sqlfluff's linting of the compiled file.

Solution

Remove the trailing whitespaces and use {%- ... -%} instead of {% ... %} in the macro statements.

Checklist

• This code is associated with an issue which has been triaged and accepted for development.
• I have read the contributing guide and understand what's expected of me
• I have run this code in development and it appears to resolve the stated issue
• This PR includes tests, or tests are not required/relevant for this PR
• I have updated the README.md (if applicable)