[SwitchBoard] Refactor to not create unused strings.
[SwitchBoard] Refactor to not create unused strings.

artsy/emission,artsy/eigen,artsy/eigen,artsy/emission,artsy/eigen,artsy/emission,artsy/eigen,artsy/eigen,artsy/emission,artsy/emission,artsy/eigen,artsy/eigen,artsy/emission,artsy/emission