/usr/share/bluefish/templates/C_header is in bluefish-data 2.2.10-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9
/* * */ #ifndef __ _H_ #define __ _H_ #endif __ _H_