Function switch_char_to_float 

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

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