Fix frozen string literal warnings in PP #17
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``` ruby/3.5.0+4/prettyprint.rb:184: warning: literal string will be frozen in the future (run with --debug-frozen-string-literal for more information) ruby/3.5.0+4/prettyprint.rb:541: warning: literal string will be frozen in the future (run with --debug-frozen-string-literal for more information) ```
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Fixes #14