Obfuscating strings can be hard. PrivateObfuscationMacro makes this easy by making your source code readable, and obfuscating at compile time.
One way of obfuscation is with array splitting. Simply call #arrayEncoded("foo") and at compile time, it will split the string by character into an array, and then join it back together.
Another way of obfuscation is with base64 encoding. Simply call #base64Encoded("foo") and at compile time, it will create an base64 encded string and then call a decode function.