Credo.CLI.Filename.remove_line_no_and_column

You're seeing just the function remove_line_no_and_column, go back to Credo.CLI.Filename module for more information.
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remove_line_no_and_column(filename)

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Removes the pos_suffix for a filename.

iex> Credo.CLI.Filename.remove_line_no_and_column("lib/credo/sources.ex:39:8")
"lib/credo/sources.ex"