<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def vhat(v1):
 """ Find the unit vector along a double precision 3-dimensional vector. http://naif.jpl.nasa.gov/pub/naif/toolkit_docs/C/cspice/vhat_c.html :param v1: Vector to be unitized. :type v1: 3-Element Array of floats :return: Unit vector v / abs(v). :rtype: 3-Element Array of floats """

    v1 = stypes.toDoubleVector(v1)
    vout = stypes.emptyDoubleVector(3)
    libspice.vhat_c(v1, vout)
    return stypes.cVectorToPython(vout)