How to append new string into items of a List variable

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@Komom

The image shows a debugging interface with variables, an output log displaying email addresses and strings, and a sequence workflow for string assignment and concatenation in Visual Studio. (Captioned by AI)
The image shows a debugging interface with variables, an output log displaying email addresses and strings, and a sequence workflow for string assignment and concatenation in Visual Studio. (Captioned by AI)1177×544 35 KB