To build you need a compiler for C99,

To build you need a compiler for C11,

Structs are the only types that should be declared with a capital
letter. Simple types should be declared with lowercase letters.

Use typedef sparingly, only for creating an alias for a type. Structs
should not be typedef'd, instead we use the `struct` keyword. Names
should be lowercase, preferably without underscores.

typedef struct {
	...
} Edit;

struct changeheader {
       ...
};