tokens: From the 1D char array , populate it accordingly to 2D char array based on positions , [ 0 ] [ 0 ] , [ 0 ] [ 1 ] etc
ner_tags: O O O B-Data_Type B-Data_Structure O O O O O O B-Data_Type B-Data_Structure O O O O B-Value I-Value I-Value B-Value I-Value I-Value O B-Value I-Value I-Value B-Value I-Value I-Value O