const fs = require("fs");

const c = fs.readFileSync("src/main.rs", "utf-8").split("\n");

const one = c.findIndex(l => l.includes("// 1"));

if (c[one + 1].includes("// 2")) {
    c.splice(one + 1, 1);
} else {
    c.splice(one + 1, 0, "// 2")
}

fs.writeFileSync("src/main.rs", c.join("\n"));