chore: Update template variables in structure.yaml and main.py

Author: httpdss

example/structure.yaml

@@ -1,13 +1,13 @@
 structure:
   - README.md:
       content: |
-        # {project_name}
+        # ${project_name}
         This is a template repository.
   - script.sh:
       permissions: '0777'
       content: |
         #!/bin/bash
-        echo "Hello, {author_name}!"
+        echo "Hello, ${author_name}!"
   - LICENSE:
       file: https://raw.githubusercontent.com/nishanths/license/master/LICENSE
   - .gitignore:

struct_module/main.py

@@ -78,6 +78,7 @@ def apply_template_variables(self, template_vars):
         if self.content and template_vars:
             logging.debug(f"Applying template variables: {template_vars}")
             template = Template(self.content)
+            print(template.substitute(template_vars))
             self.content = template.substitute(template_vars)
 
     def create(self, base_path, dry_run=False, backup_path=None, file_strategy='overwrite'):