How can solve that problem using strings activity, and how many way solve that problem

Hey @Kailash_Singh

Use the same LinQ as suggested by @Dheerendra_vishwakarma in below post with some changes

Use below LinQ:

(
From row In in_DT
Select out_DT.Rows.Add(row(0).ToString.Split("', '").Select(Function(x) x.ToString.Replace("(","").Replace("'","").Replace(")","").Replace(",",".")).ToArray)
).copytodatatable

That’s it!

Happy Automation

Regards,
Ajay Mishra