rumdl 0.0.12

A fast Markdown linter written in Rust (Ru(st) MarkDown Linter)
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# MD021 - No Multiple Spaces in Closed ATX Heading

## Description

This rule ensures that there is only one space between the hash signs (#) and the heading text in closed ATX-style headings.
Multiple spaces can cause inconsistent rendering across different Markdown processors.

<!-- markdownlint-disable -->
## Examples

### Valid

```markdown
# Heading 1 #
## Heading 2 ##
### Heading 3 ###
#### Heading 4 ####
##### Heading 5 #####
###### Heading 6 ######
```

### Invalid

```markdown
#  Heading 1  #
##  Heading 2  ##
###   Heading 3   ###
####    Heading 4    ####
#####     Heading 5     #####
######      Heading 6      ######
```

### Fixed

```markdown
# Heading 1 #
## Heading 2 ##
### Heading 3 ###
#### Heading 4 ####
##### Heading 5 #####
###### Heading 6 ######
```
<!-- markdownlint-enable -->

## Special Cases

- This rule only applies to closed ATX-style headings (those with hash signs at both the beginning and end)
- It does not apply to regular ATX headings (those with hash signs only at the beginning)
- It does not apply to setext-style headings (those underlined with = or -)
- Empty headings (just hash signs with no text) are not affected
- The rule checks for multiple spaces both before and after the heading text

## Related Rules

- [MD018 - No missing space in ATX heading](md018.md): Ensures there is a space after the hash signs in regular ATX headings
- [MD019 - No multiple spaces after hash in ATX heading](md019.md): Similar rule for regular ATX headings
- [MD020 - No missing space in closed ATX heading](md020.md): Ensures there is a space between the hash signs and heading text