You want to insert a string on each line of a region-rectangle in #Emacs text editor? So:
mark beginning of the rectangle + go to the end of the rectangle + C-x r t string RET
OR
select the lines + "string-rectangle" command
And it's done :-)
Source: the good old manual.
Good multiline #text #format editing!

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@ThierryStoehr Neat! That was my main use case for ‘multiple-cursors’.

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