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[ BUG ] ":" symbol generates unnecessary hyphen

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Assessment

Difficulty
3/5
Estimated time
1-2 days
Newbie friendliness
45/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Stale
Tech stack
markdown, shell

Research direction

Start by tracing the heading-to-anchor generation used by the online tool for the reproduced Markdown headings. Compare the generated anchors with the expected single-hyphen output for headings containing a colon, then verify both examples and confirm that unrelated heading conversion still works.

Written by the indexing model from the issue text.

Description

bug

Describe the bug
The online tool doesn't work with headers like this: "# Chapter 1: Introducing to something". Symbol : is replaced with hyphen, but it should be removed altogether as per explanation.

To Reproduce

# Chapter 1: Introducing
# Chapter 2: The Foundations

Generates:

- [Chapter 1: Introducing](#chapter-1--introducing)
- [Chapter 2: The Foundations](#chapter-2--the-foundations)

Expected behavior
No double hyphen between 1-introducing

- [Chapter 1: Introducing](#chapter-1-introducing)
- [Chapter 2: The Foundations](#chapter-2-the-foundations)

Environment (please complete the following information):
Online tool: https://ecotrust-canada.github.io/markdown-toc/

Dominant language
Shell
Stars
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Forks
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Avg merge
20m
Merged PRs (30d)
7

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