def Imm_gen(inst_code: str) -> str:
    test = inst_code[25:32]
    if test in ['0010011', '0000011', '1100111']:  # i-Type, l, jalr
        imm_out = inst_code[0:12].rjust(32, inst_code[0])
    elif test == '0100011':  # s
        imm_out = (inst_code[0:7] + inst_code[20:25]).rjust(32, inst_code[0])
    elif test == '1100011':  # branch
        imm_out = (inst_code[0] + inst_code[24] + inst_code[1:7] +
                   inst_code[20:24]).rjust(32, inst_code[0])
    elif test == '1101111':  # jal
        imm_out = (inst_code[0] + inst_code[12:20] + inst_code[11] +
                   inst_code[1:11]).rjust(32, inst_code[0])
    elif test in ['0110111', '0010111']:  # lui, auipc
        imm_out = inst_code[0:20].rjust(32, inst_code[0])
    else:
        imm_out = '0' * 32
    return imm_out