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String formatting / manipulation in combination with Matlab Coder

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Matlab Coder is used in a project to generate C code from an algorithm designed in Matlab. Comprehensive messages are constructed in the algorithm to provide meaningful feedback as output of the primary function (entry-point function). I know that sprintf is not supported by the Coder toolbox. Is there a different way to construct/concatenate/manipulate strings in Matlab that is supported by the Coder?
What I (for example) would like to do: (abstracted code here)
[resultValue, outputMessage] = functionName(inputArgument)
% Some calculations here that set the resultValue.
% The number of iterations used to get to the end result is also calculated.
outputMessage = sprintf('%d iterations were used.', numberOfIterations);
end
The output string can of course be much more complex, or a concatenation of several messages that occurred during the execution of the algorithm.

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