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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def get_vasp_kpoint_file_sym(structure):
 """ get a kpoint file ready to be ran in VASP along the symmetry lines of the Brillouin Zone """

    output = run_aconvasp_command(["aconvasp", "--kpath"], structure)
    if "ERROR" in output[1]:
        raise AconvaspError(output[1])
    started = False
    kpoints_string = ""
    for line in output[0].split("\n"):
        #print line
        if started or line.find("END") != -1:
            kpoints_string = kpoints_string + line + "\n"
        if line.find("KPOINTS TO RUN") != -1:
            started = True
        if line.find("END") != -1:
            started = False
    return kpoints_string