code: private String getVariableName(Class clazz, int nodeId) {
          String type = clazz.getSimpleName();
          return Character.toLowerCase(type.charAt(0)) + type.substring(1) + nodeId;
      }
docs: Returns a variable name based on the simple name of the specified class appended with the specified
  nodeId.
  
  @param clazz  class whose simple name is lowercased and user as the prefix of the variable name
  @param nodeId id of {@link org.kie.common.NetworkNode}
  @return variable name
  @see Class#getSimpleName()