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Eduardo Ponce authored and Antoine Pitrou committed e9eeff1c929
ARROW-12714: [C++] String title case kernel This PR adds scalar string compute functions for titlecasing a string, namely "ascii_title" and "utf8_title". Simple titlecasing is performed, only every cased character following an uncased character is uppercased. Additional changes included with this PR are: * restructure StringTransformCodepointXXX classes to support vector string kernels using codepoint transforms * update capitalize kernels Closes #10869 from edponce/ARROW-12714-String-title-case-kernel Authored-by: Eduardo Ponce <edponce00@gmail.com> Signed-off-by: Antoine Pitrou <antoine@python.org>