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