parse_scheme

Description:

[ Version ( since = "2.16" ) ]
public static string? parse_scheme (string uri)

Gets the scheme portion of a URI string.

[RFC 3986](https://tools.ietf.org/html/rfc3986section-3) decodes the scheme as:

URI = scheme ":" hier-part [ "?" query ] [ "#" fragment ]

Common schemes include `file`, `https`, `svn+ssh`, etc.

uri	a valid URI.

The ‘scheme’ component of the URI, or null on error. The returned string should be freed when no longer needed.