Initialize the string of known length

I have searched the forums, but found nothing. I'm trying to convert a string to its equivalent representation in ASCII form. So I use the string depending on the byte array. But then I want to have a string with all these bytes concatenated sets. One way to do this is to initialize a string empty in the shift to a loop, then register use the hexadecimal string inside the loop number For and concatenate the bytes. See the following excerpt for the code:

The problem, then, is that you have a function to concatenate strings inside a loop, which calls the handler memory each iteration of the loop For, except if I'm wrong. Now that I know, before entering the loop, how long the resulting string will be (only twice the number of elements in the byte array), I'd rather do is initialize a string to the appropriate length and then simply replace the elements in the chain I. Something like the following:

How do I what is represented by my comment? I couldn't care less what is happening in the chain, of course. I want just the string of the correct length, enter the loop For. Any ideas?

Thank you!

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