file program issue

digraph _OP_control_flow {
graph [center=true,
    epsilon=".000001",
    pack=true,
    rankdir=LR,
    ratio=compress,
    sep=".5",
    size="5.83,8.27",
    splines=true
];
node [fillcolor="#fff9f9",
    shape=doublecircle,
    style=filled
];
B02  [fillcolor="#fff3f3",
    shape=circle];
B01 -> B02;
B03  [shape=circle];
B02 -> B03;
B04  [shape=circle];
B03 -> B04;
B05  [fillcolor="#ffecec",
    shape=circle];
B04 -> B05;
B06  [shape=circle];
B05 -> B06;
B07  [fillcolor="#ffe6e6",
    shape=circle];
B06 -> B07;
B08  [shape=circle];
B07 -> B08;
B09  [fillcolor="#ffecec",
    shape=circle];
B08 -> B09;
B10  [shape=circle];
B09 -> B10;
B11  [fillcolor="#ffa0a0",
    shape=circle];
B10 -> B11;
B12  [fillcolor="#ffe0e0",
    shape=circle];
B11 -> B12   [label="{5}"];
B14  [fillcolor="#ffa0a0",
    shape=circle];
B11 -> B14   [label="{4}"];
B13  [fillcolor="#ffc0c0",
    shape=circle];
B12 -> B13   [label="{5}"];
B13 -> B14   [label="{5}"];
B15  [fillcolor="#ffe6e6",
    shape=circle];
B14 -> B15;
B16  [fillcolor="#ffcccc",
    shape=circle];
B15 -> B16;
B17  [fillcolor="#ff4d4d",
    shape=circle];
B16 -> B17   [label="{4}"];
B21  [fillcolor="#ffcccc",
    shape=circle];
B16 -> B21   [label="{3}"];
B18  [fillcolor="#ff0000",
    shape=circle];
B17 -> B18   [label="{10}"];
B19  [fillcolor="#ffc0c0",
    shape=circle];
B17 -> B19   [label="{10}"];
B17 -> B21   [label="{4}"];
B18 -> B19   [label="{4}"];
B20  [fillcolor="#ffb3b3",
    shape=circle];
B18 -> B20   [label="{6}"];
B20 -> B19   [label="{6}"];
B22  [shape=circle];
B21 -> B22;
B23  [shape=circle];
B22 -> B23;
B24  [fillcolor="#ffecec",
    shape=circle];
B23 -> B24;
B25  [fillcolor="#fff3f3",
    shape=circle];
B24 -> B25;
B26  [fillcolor="#ff8080",
    shape=circle];
B25 -> B26;
B27  [fillcolor="#ffc0c0",
    shape=circle];
B26 -> B27   [label="{5}"];
B29  [fillcolor="#ffc0c0",
    shape=circle];
B26 -> B29   [label="{4}"];
B28  [fillcolor="#ffe0e0",
    shape=circle];
B27 -> B28   [label="{5}"];
B28 -> B29   [label="{5}"];
B30  [shape=circle];
B29 -> B30;
B31  [fillcolor="#fff3f3",
    shape=circle];
B30 -> B31;
B32  [shape=circle];
B31 -> B32;
B32 -> B33;

}

c program that will read whole file and where in that file this symbol i.e -> appears, concantenate the string before and after that symbol and save it in an array

for eg save it as B01->B02 ...