question: public static String interpolate ( String input , final Map < String , String > namedArgs , final Map < String , String > defaultArgs ) { if ( namedArgs == null || input == null ) { return input ; } final Map < String , String > interpolationArgs = createFinalInterpolationMap ( namedArgs , defaultArgs ) ; return StrSubstitutor . replace ( input , interpolationArgs , PREFIX , SUFFIX ) ; }
target:  Performs variable interpolation using the named arguments from an Action on a single String