Concatenate elements of a string array
String_Type strjoin (Array_Type a, String_Type delim)
The strjoin function operates on an array of strings by joining
successive elements together separated with a delimiter delim.
If delim is the empty string "", then the result will
simply be the concatenation of the elements.
Suppose that
days = ["Sun","Mon","Tue","Wed","Thu","Fri","Sat","Sun"];
Then strjoin (days,"+") will produce
"Sun+Mon+Tue+Wed+Thu+Fri+Sat+Sun". Similarly,
strjoin (["","",""], "X") will produce "XX".
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