Hey guys

This is my first time posting here. I'm not new to After Effects however I am having some real difficulties doing what should be a simple task.

What I'm trying to do is to have a shape transform into another shape over time. Now I've done this a million times but with this particular project I'm having some issues. The first shape is a circle, or 3/4 of a circle. I don't know if this shape has a name but just look at the screen grabs. I want it to transform into an arrow. The problem I'm having with this is that the paths overlap in the middle of the transformation leaving like white spots where I don't want them. I know this is a terrible explanation but maybe you guys can figure out what I mean from the screengrabs. Any help is really appreciated.

Thanks.