Returns the string, first removing all whitespace on both ends of the string, and then changing remaining consecutive whitespace groups into one space each.
Examples:
%{ Multi-line string }.squish # => "Multi-line string" " foo bar \n \t boo".squish # => "foo bar boo"
# File lib/active_support/core_ext/string/filters.rb, line 13 def squish dup.squish! end
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