Please explain what you need in more detail. Do you want to concatenate all the elements of the string array into one single string or is is something else you want to do?
If you are trying to write array of strings to a data file (for example excel) then take a look at Array to Spreadsheet string in String functions.
Try to connect "Concatenate Strings" (from functions->strings pallete) with one input connected to your array and the output is a single string containg all you array strings.
Maximus00, as Pavel indicated, there is a lesser known feature of "Concatenate Strings" that does exactly what your code is doing if the input is an array of strings. In one step! 🙂 See attached image.