refactored ListString #190

Job	Run time
Build on macOS (macos-12, /Applications/Xcode_13.3.app, 15.4, 8.5, Apple Watch Series 7 - 41mm, i...	8m 40s
Build on Ubuntu (ubuntu-20.04, 5.7.3)	1m 30s
Build on macOS (macos-12, /Applications/Xcode_13.4.1.app, 15.5, 8.5, Apple Watch Series 7 - 41mm,...	8m 31s
Build on Ubuntu (ubuntu-20.04, 5.8)	1m 36s
Build on macOS (macos-12, /Applications/Xcode_14.0.1.app, 16.0, 9.0, Apple Watch Series 8 (41mm),...	9m 49s
Build on Ubuntu (ubuntu-22.04, 5.7.3)	1m 32s
Build on macOS (macos-12, /Applications/Xcode_14.1.app, 16.1, 9.1, Apple Watch Ultra (49mm), iPho...	14m 11s
Build on Ubuntu (ubuntu-22.04, 5.8)	1m 41s
Build on macOS (macos-12, /Applications/Xcode_14.2.app, 16.2, 9.1, Apple Watch Ultra (49mm), iPho...	13m 41s
Build on Ubuntu (ubuntu-20.04, 5.5.3)	1m 47s
Build on macOS (macos-13, /Applications/Xcode_14.3.1.app, 16.4, 9.4, Apple Watch Ultra (49mm), iP...	41m 47s
Build on Ubuntu (ubuntu-20.04, 5.6.3)	1m 34s
Build on macOS (macos-13, /Applications/Xcode_15.0.app, 17.0, 10.0, Apple Watch Ultra (49mm), iPh...	20m 3s
	2h 6m 22s

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