Resolve n8n Agent Data Merge Issue

I am encountering an execution error in my n8n agent workflow during the merge with data from a Google Sheet. The data being merged is text only and requires complex transformations such as concatenation.

I'm currently facing issues with my n8n workflow primarily due to node configuration errors.
The workflow is designed to read data from Google Sheets but is encountering a data format mismatch.
The workflow is in attachment

The flow must check whether a word exists within a google sheet column, if it exists it takes the word and inserts it in a row, if it does not exist then it will give a negative answer
I have a problem with the merge

This project requires an expert in n8n with a proven track record of troubleshooting node configuration errors. The ideal candidate should have experience with Google Sheets and be able to identify and rectify data format issues. Please note, I am not experiencing any authentication errors or incorrect data range issues.

If you have the necessary skills and experience, I would be happy to discuss this project further.

Key Requirements:
- Proficient in using n8n workflows.
- Experienced with Google Sheets data integration.
- Skilled in complex data transformations.
- Problem-solving capability to fix execution errors.

Please reach out if you can assist.