etc/octaspire_easing_amalgamated.c
double octaspire_easing_out_quart(double t, double const b, double const c, double const d)
{
    t = (t / d) - 1;
    return -c * (pow(t, 4) - 1) + b;
}
// quartic easing out - decelerating to zero velocity
quartic easing out - decelerating to zero velocity
quartic easing out - decelerating to zero velocity
double octaspire_easing_out_quart(double t, double const b, double const c, double const d)
{
    t = (t / d) - 1;
    return -c * (pow(t, 4) - 1) + b;
}
double octaspire_easing_out_quart ( double t , double const b , double const c , double const d ) { t = ( t / d ) - 1 ; return - c * ( pow ( t , 4 ) - 1 ) + b ; }
quartic easing out - decelerating to zero velocity
quartic easing out - decelerating to zero velocity