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* common/file_util: Make IOFile's WriteString take a std::string_view We don't need to force the usage of a std::string here, and can instead use a std::string_view, which allows writing out other forms of strings (e.g. C-style strings) without any unnecessary heap allocations. * common/file_util: Remove unnecessary c_str() calls The file stream open functions have supported std::string overloads since C++11, so we don't need to use c_str() here. Same behavior, less code. * common/file_util: Make ReadFileToString and WriteStringToFile consistent Makes the parameter ordering consistent, and also makes the filename parameter a std::string. A std::string would be constructed anyways with the previous code, as IOFile's only constructor with a filepath is one taking a std::string. We can also make WriteStringToFile's string parameter utilize a std::string_view for the string, making use of our previous changes to IOFile. * common/file_util: Remove duplicated documentation comments These are already present within the header, so they don't need to be repeated in the cpp file. * common/file_util: Make GetCurrentDir() return a std::optional nullptr was being returned in the error case, which, at a glance may seem perfectly OK... until you realize that std::string has the invariant that it may not be constructed from a null pointer. This means that if this error case was ever hit, then the application would most likely crash from a thrown exception in std::string's constructor. Instead, we can change the function to return an optional value, indicating if a failure occurred. * common/file_util: Remove unnecessary return at end of void StripTailDirSlashes() While we're at it, also invert the conditional into a guard clause.