fix: change the behavior of printf in string op.

- add compiler hint for checking the arguments of printf.
- change the return value of printf. from std::expected to normal value. use C++ exception to indicate error.
	* the error of printf usually caused by programmer. so it can be found when testing program.
	* so i use std::logic_error to indicate this and programmer should fix this before releasing program.
- change the use of encoding convertion. for those cases that convertion must be safe, we unwrap it directly.

testbench/CMakeLists.txt

@@ -39,6 +39,7 @@ PRIVATE
     yycc/carton/termcolor.cpp
     yycc/carton/wcwidth.cpp
     yycc/carton/tabulate.cpp
+    yycc/carton/clap.cpp
 )
 target_sources(YYCCTestbench
 PRIVATE