Function substitute 

pub fn substitute<'a, 'b>(
    text: &'b str,
    substitutions: &[Substitution],
    attributes: &DocumentAttributes<'a>,
) -> Cow<'b, str>
where
    'a: 'b,

Apply a sequence of substitutions to text.

Iterates through the substitution list and applies each in order:

• Attributes - Expands {name} references using document attributes
• Normal / Verbatim - Recursively applies the corresponding substitution group
• All others (SpecialChars, Quotes, Replacements, Macros, PostReplacements, Callouts) - No-op; handled by converters

Example

use acdc_parser::{DocumentAttributes, AttributeValue, Substitution, substitute};

let mut attrs = DocumentAttributes::default();
attrs.set("version".into(), AttributeValue::String("1.0".into()));

let result = substitute("Version {version}", &[Substitution::Attributes], &attrs);
assert_eq!(result, "Version 1.0");