test.js

function extractCode(response) {
    const startDelimiter = "```mermaid";
    const endDelimiter = "```";
    let startIndex = response.indexOf(startDelimiter);
    const codes = [];
  
    while (startIndex !== -1) {
      const endIndex = response.indexOf(
        endDelimiter,
        startIndex + startDelimiter.length
      );
      if (endIndex !== -1) {
        // Extract code and remove the first line
        let code = response.substring(startIndex, endIndex).trim();
        // Remove the first line
        code = code.substring(code.indexOf("\n") + 1);
        codes.push(code);
      }
      startIndex = response.indexOf(
        startDelimiter,
        endIndex + endDelimiter.length
      );
    }
  
    return codes;
  }
  
  const response = {
    role: "assistant",
    content:
      "```mermaid\n" +
      "graph TD;\n" +
      "  A(Frontend)-->B(Component1);\n" +
      "  A-->C(Component2);\n" +
      "  B-->D(SubComponent1);\n" +
      "  C-->E(SubComponent2);\n" +
      "  D-->F(API1);\n" +
      "  E-->G(API2);\n" +
      "  F-->H(Database1);\n" +
      "  G-->I(Database2);\n" +
      "  H-->J(Cache1);\n" +
      "  I-->K(Cache2);\n" +
      "```\n" +
      "```mermaid\n" +
      "subgraph Backend\n" +
      "  B(Component1)-->D(SubComponent1);\n" +
      "  C(Component2)-->E(SubComponent2);\n" +
      "  D(SubComponent1)-->F(API1);\n" +
      "  E(SubComponent2)-->G(API2);\n" +
      "  F(API1)-->H(Database1);\n" +
      "  G(API2)-->I(Database2);\n" +
      "  H(Database1)-->J(Cache1);\n" +
      "  I(Database2)-->K(Cache2);\n" +
      "end\n" +
      "```\n" +
      "```mermaid\n" +
      "subgraph Routes\n" +
      "  H(Database1)-->L(Route1);\n" +
      "  I(Database2)-->M(Route2);\n" +
      "  J(Cache1)-->N(Route3);\n" +
      "  K(Cache2)-->O(Route4);\n" +
      "end\n" +
      "```\n" +
      "```mermaid\n" +
      "subgraph Frontend\n" +
      "  A(Frontend)-->P(Redux);\n" +
      "  P(Redux)-->Q(React);\n" +
      "  P(Redux)-->R(Saga);\n" +
      "end\n" +
      "```",
  };
  
  const codes = extractCode(response.content);
  const final = codes.join('\n\n');
  console.log(final)