Function ImPlot_BeginSubplots 

pub unsafe extern "C" fn ImPlot_BeginSubplots(
    title_id: *const c_char,
    rows: c_int,
    cols: c_int,
    size: ImVec2,
    flags: ImPlotSubplotFlags,
    row_ratios: *mut f32,
    col_ratios: *mut f32,
) -> bool