Function switch_float_to_char 

pub unsafe extern "C" fn switch_float_to_char(
    f: *mut f32,
    c: *mut c_char,
    len: c_int,
) -> c_int

\brief Convert an array of floats to an array of chars \param f an array of floats \param c an array of chars \param len the length of the buffers \return the size of the converted buffer