Fix incorrect name creation in AggregateManager.
Fix incorrect name creation in AggregateManager.

A few places were adding a char to a raw string, which acts as an
index rather than concatenation. Fix it by explicitly creating strings
before appending them.

sirikata/sirikata,sirikata/sirikata,sirikata/sirikata,sirikata/sirikata,sirikata/sirikata,sirikata/sirikata,sirikata/sirikata,sirikata/sirikata