normalizePath abstract method
Returns a URI where the path has been normalized.
A normalized path does not contain . segments or non-leading ..
segments.
Only a relative path with no scheme or authority may contain
leading .. segments;
a path that starts with / will also drop any leading .. segments.
This uses the same normalization strategy as Uri().resolve(this).
Does not change any part of the URI except the path.
The default implementation of Uri always normalizes paths, so calling
this function has no effect.
Implementation
Uri normalizePath();