Appends the value of the In String 2 input to the value of the In String 1 input.
A String object that contains the string from In String 1 with the string from In String 2 appended. For example, if the value of In String 1 is "Hello world." and the value of In String 2 is "How are you?", the output of this function block is the string "Hello world. How are you?".