Escaping markdown better #142
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This change refactors `escapeMarkdownV2` to use a manual switch statement, ensuring that all reserved characters (including backslashes and dots) are explicitly and correctly escaped. This resolves issues where unescaped special characters, particularly in edge cases involving existing backslashes, caused `400 Bad Request` errors from the Telegram API. - Replaced `strings.NewReplacer` with a rune-based loop. - Added explicit test case for trailing dots and backslashes to prevent regression.
Correctly escape Telegram MarkdownV2 special characters
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