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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 writln(line, unit):
 """ Internal undocumented command for writing a text line to a logical unit No URL available; relevant lines from SPICE source: FORTRAN SPICE, writln.f:: C$Procedure WRITLN ( Write a text line to a logical unit ) SUBROUTINE WRITLN ( LINE, UNIT ) CHARACTER*(*) LINE INTEGER UNIT C Variable I/O Description C LINE I The line which is to be written to UNIT. C UNIT I The Fortran unit number to use for output. CSPICE, writln.c:: /* $Procedure WRITLN ( Write a text line to a logical unit ) */ /* Subroutine */ int writln_(char *line, integer *unit, ftnlen line_len) :param line: The line which is to be written to UNIT. :type line: str :param unit: The Fortran unit number to use for output. :type unit: int """

    lineP    = stypes.stringToCharP(line)
    unit     = ctypes.c_int(unit)
    line_len = ctypes.c_int(len(line))
    libspice.writln_(lineP, ctypes.byref(unit), line_len)