Remove excess whitespace characters from a string
String_Type strtrim (String_Type s, String_Type white)
The strcompress function compresses the string s by
removing all repeated characters specified by by the characters of
white from the interior of s. In addition, it also
removes all leading and trailing characters from s that are
part of white.
The expression
strcompress (",;apple,,cherry;,banana", ",;");
returns the string @"apple,cherry;banana"@.
strtrim