syntax highlighting works for c++ but not c. since c++ and c are mostly the same, should be an easy fix.
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go to .config/juff/hlschemes and open the cppscheme.xml
add c (or the fileending you have) to this line:
<scheme name="C++" extensions="cpp;hpp;cxx;hxx;c++;h;h++;c">
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Accepted. The next release will contain separate scheme for C (since C++ has more keywords than C does). This time you can use the previous advice as a temporary fix.