C++

Fix decoding of %c (used in BESTUTM) #3

Job	Run time
clang-tidy	10m 49s
clang-format	15s
code-coverage	2m 26s
CMake - windows - msvc - Debug	5m 24s
editorconfig	5s
CMake - windows - msvc - Release	4m 9s
CMake - windows - gnu - Debug	6m 1s
documentation	1m 12s
CMake - windows - gnu - Release	4m 0s
CMake - windows - clang-cl - Debug	5m 23s
CMake - windows - clang-cl - Release	6m 45s
CMake - linux - gnu - Debug	2m 4s
CMake - linux - gnu - Release	1m 32s
CMake - linux - clang - Debug	3m 9s
CMake - linux - clang - Release	3m 16s
	56m 30s

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