ENH: Update main.cpp

This update ensures that there are no inconsistencies when the ouput directory has already been build then it just doesn't appends but first removes and then writes to the output directory.

Tests Passed: Yes

src/main.cpp

@@ -44,6 +44,7 @@ int main( int argc, char * argv[] )
     fmt::print( "Using input file: {}\n", config_file_path.string() );
     fmt::print( "Output directory path set to: {}\n", output_dir_path.string() );
 
+    fs::remove_all(output_dir_path);// Remove any existing output directory
     fs::create_directories( output_dir_path ); // Create the output directory
 
     auto simulation_options = Seldon::Config::parse_config_file( config_file_path.string() );