implode [s1;...;sn] returns the string formed by concatenating the
strings s1 ... sn. If n is zero (the list is empty), then the empty string
is returned.
FAILURE CONDITIONS
Never fails; accepts empty or multi-character component strings.
EXAMPLE
# implode ["e";"x";"a";"m";"p";"l";"e"];;
val it : string = "example"
# implode ["ex";"a";"mpl";"";"e"];;
val it : string = "example"