Could someone please explain the below code to me. This is part of a heliostat code written by Jremington. Why do we have '*' before ele and az (which stands for elevation and azimuth)

Basically, I am trying to understand the code for the conversion of spherical coordinates to cartesian coordinates

void xyz_to_eleAz(float * ele, float * az, float xyz[3]){
float rtd = 180.0 / PI;
float v[3], m = 0;
// normalize input vector
for (byte i = 0; i < 3; i++)
m = m + (xyz[i] * xyz[i]);
m = sqrt(m);
for (byte i = 0; i < 3; i++)
v[i] = xyz[i] / m;
float t = rtd * atan2(v[0], v[1]);
if (t < 0.0) {
t = t + 360.0; //compass wrap
}
*az = t;
*ele = rtd * asin(v[2]);

If anyone could also suggest the formula or code required to write create the conversion. Why are we normalising the data?