You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: build.rs
    path of file: ./repos/LakeSoul/rust/lakesoul-io-c
    
    the code of the file until where you have to start completion: extern crate cbindgen;

use std::env;

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let crate_dir = env::var("CARGO_MANIFEST_DIR")?;

    cbindgen::Builder
    
fn main() -> Result<(), Box<dyn std::error::Error>> {
    let crate_dir = env::var("CARGO_MANIFEST_DIR")?;

    cbindgen::Builder::new()
        .with_crate(crate_dir)
        .with_include_guard("LAKESOUL_C_BINDINGS_H")
        .with_include("stddef.h")
        .with_namespace("lakesoul")
        .with_after_include("\nnamespace lakesoul {\ntypedef ptrdiff_t c_ptrdiff_t;\ntypedef size_t c_size_t;\n}")
        .generate()
        .expect("Unable to generate bindings")
        .write_to_file("lakesoul_c_bindings.h");
    Ok(())
}