withDefaultExtension

auto withDefaultExtension(R,  C)(R path,  C[]  ext) if (isRandomAccessRange!R &&  hasSlicing!R &&  hasLength!R &&  isSomeChar!(ElementType!R)  &&
    !isSomeString!R &&  isSomeChar!C)

Set the extension of path to ext if path doesn't have one.

Parameters

`path`	filespec as string or range
`ext`	extension, may have leading '.'

Returns

range with the result

fnauto withDefaultExtension(C1, C2)(C1[] path, C2[] ext) if (isSomeChar!C1 && isSomeChar!C2)

Ditto