/in/Rectangle.c:3:11: error: conflicting types for 'create_rectangle'
 Rectangle create_rectangle(double left_down_p, double right_up_p){
           ^~~~~~~~~~~~~~~~
In file included from /in/Rectangle.c:1:0:
/in/compile/Rectangle.h:21:11: note: previous declaration of 'create_rectangle' was here
 Rectangle create_rectangle(const Point* left_down_p, const Point* right_up_p);
           ^~~~~~~~~~~~~~~~
/in/Rectangle.c: In function 'create_rectangle':
/in/Rectangle.c:4:22: error: missing braces around initializer [-Werror=missing-braces]
     Rectangle rect = {left_down_p, right_up_p};
                      ^
                       {                      }
/in/Rectangle.c:4:5: error: missing initializer for field 'right_up_p' of 'Rectangle {aka struct <anonymous>}' [-Werror=missing-field-initializers]
     Rectangle rect = {left_down_p, right_up_p};
     ^~~~~~~~~
In file included from /in/Rectangle.c:1:0:
/in/compile/Rectangle.h:13:11: note: 'right_up_p' declared here
     Point right_up_p;
           ^~~~~~~~~~
cc1: all warnings being treated as errors