Learn to concatenate strings.

Assignment: You need to send some data to a remote server that reads a stream of characters. The server works as follows: it first reads the length of the string that it should parse, followed by a space, and finally, the actual string.

Given the string message, write some code that follows the above format and assigns its value to the previously declared String variable formattedMessage. For example, if message were "Hello World!", formattedMessage should be $"12$ Hello World!".