Simplify Config.h using stdlib.h

Change-Id: I4d5bf11d58773ea52d04329769cb06cb9ac7e99e
Added operator+() for string

Change-Id: I264903477f62d609efe47f89fbc2075665f2f4ea
Reformat source

Change-Id: I5dc0e0cd9e0d0d78c7bec43033e844b39e056b72