Append True/False String

Selects either a false or true string according to a Boolean selector and appends that string to string.

string is the input string. The default is an empty string.
true string is the string to append if selector is true.
false string is the string to append if selector is false.
If selector is TRUE, the function appends true string to string. If selector is FALSE, the function appends false string to string.
output string is the resulting string.