AwkChannelWiki: string manipulation

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Summary: index updated

Added:

> * Test for an [[empty string]]

case conversion
Determine the length of a string
Determine the position of a substring within a string
Removing the first and last characters from a string
Reverse a string
Splicing a string at arbitary positions
Strip whitespace from a string
Strip control codes and extended characters from a string
Test for an [[empty_string?]]
[[transliteration?]]