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Fix decoding of %c (used in BESTUTM) #297

Job	Run time
clang-tidy	11m 34s
code-coverage	2m 22s
CMake - windows - msvc - Debug	5m 40s
clang-format	16s
CMake - windows - msvc - Release	4m 39s
documentation	9s
CMake - windows - gnu - Debug	7m 13s
editorconfig	7s
CMake - windows - gnu - Release	4m 51s
CMake - windows - clang-cl - Debug	8m 20s
CMake - windows - clang-cl - Release	6m 4s
CMake - linux - gnu - Debug	2m 0s
CMake - linux - gnu - Release	2m 2s
CMake - linux - clang - Debug	3m 26s
CMake - linux - clang - Release	3m 36s
	1h 2m 19s

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