graph.dot

digraph structs {
    node [shape=record];
    {
       rank=same
       struct1 [label="{<ptr> ptr|{len|5}|{capacity|5}}"];
       struct3 [label="{{<0> 0|h}|{1|e}|{2|l}|{3|l}|{4|o}}}"];
    }
    struct1:ptr -> struct3:0;
}