def split_files(baseFilename):
    # Define the file extensions and corresponding output file names
    extensions = {'.c': 'c_', '.cpp': 'cpp_', '.cs': 'cs_'}

    # Create output files for each extension type
    output_files = {}
    for extension, prefix in extensions.items():
        output_filename = f"{prefix}{baseFilename}.txt"
        output_files[extension] = open(output_filename, 'w')

    # Read and process the input file
    with open(baseFilename, 'r') as input_file:
        current_extension = None
        for line in input_file:
            line = line.strip()
            if line.endswith(tuple(extensions.keys())):
                current_extension = line[line.rfind('.'):].lower()
            elif current_extension:
                output_files[current_extension].write(line + '\n')

    # Close all output files
    for file in output_files.values():
        file.close()

# Example usage
baseFilename = "file_00.txt"
split_files(baseFilename)