Fix issue #19: Handle similarly named column headers in merger

[sweep-ai]

Description

This PR addresses issue #19 by modifying the combine function in internal/merger.go to handle similarly named column headers. It introduces a map to store unique headers and their corresponding column indices, and modifies the loop that writes the rows to the output file to merge the data from similarly named columns. It also handles the case where a file does not have a column for a certain header by writing an empty string for that column in the output file.

Summary of Changes

• Modified the combine function in internal/merger.go to handle similarly named column headers.
• Created a map to store unique headers and their corresponding column indices.
• Modified the loop that writes the rows to the output file to merge the data from similarly named columns.
• Handled the case where a file does not have a column for a certain header by writing an empty string for that column in the output file.

Fixes #19.

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git checkout sweep/fix-issue-19-handle-similarly-named-columns

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