code: def main():
      lines = []
      with open(os.path.join(HERE, "blake2b_impl.c")) as f:
          for line in f:
              line = line.replace("blake2b", "blake2s")
              line = line.replace("BLAKE2b", "BLAKE2s")
              line = line.replace("BLAKE2B", "BLAKE2S")
              lines.append(line)
      with open(os.path.join(HERE, "blake2s_impl.c"), "w") as f:
          f.write("".join(lines))
  
imports: import os
  import re
label_desc: Use image node_id 3 for calling a global function with example usage: main() without return types