Hello. This is caused by injection into one of Joomla files. You need remove this injection (and do not touch Joomla code) and then wait until Google will re-index your website and remove this link from results.
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Hello
I am Joomla expert and ready to help
Please send me a message so that we can discuss your project details.
Looking forward to hearing from you soon.
Thank you for your time.
Sincerely
Smbat
Dear Sir, I have read your job description. I have one question. You want to clear malware code or create new template. I have 5 years experience about joomla. You can check my portfolio for my previous work. I am available from now and weekly 40 hours. Waiting for your reply.
Thanks.