path when its extension is already extension (without the dot); otherwise a new string with
.extension added. Another extension is kept, so a.txt becomes a.txt.png.
path_ensure_extension :: (path: string, extension: string) -> stringThe result is path itself in the first case, which the caller must not free; in the second it is
allocated with the context allocator and the caller frees it.
Parameters
- path: string
- extension: string
Returns
- string
same := path_ensure_extension("a.png", "png");
assert(same == "a.png");
longer := path_ensure_extension("a", "png");
defer free(longer);
assert(longer == "a.png");