file1 is common_modify.vhd which has following lines of codes 
    sum_1_SUM0_0 : XOR3
      port map(A => b_c, B => a_c, C => c_c, Y => sum_c);
     
    a_pad : INBUF
      port map(PAD => a, Y => a_c);
    sum_1_CO0_i : MAJ3
      port map(A => a_c, B => c_c, C => b_c, Y => N_5);