code: public static String getSolutionFromFile(Class<?> koanClass, String methodName){
          return getSourceFromFile(koanClass, methodName, SOLUTION_EXTENSION);
      }
docs: Gets solution for a koan by method name.
  
  @param koanClass the koan class
  @param methodName the method name of the solution required
  @return the solution content to be inserted between the koan start and end markers