Explain the function of private structure

If it is not possible to make the structure type, say log as above, to be "private", does it mean that even though other source files do not know the existence of the name (which is log in my example) of the structure, accidental name collisions can still happen if they name some variables log (assuming I will link all object files) ?s it possible to declare a structure type that is only visible in the .c file which uses the structure? I know that by putting static in front of a external data object, you change the linkage of the variable to be internal. But is it possible to put static in front of the declaration of a new struct type, like the following?

answer; monaxial;