Print curly-brace-enclosed structures (C, Rust) from files in directories

what.py

import os
import re

files = []
dirlist = ['src']

while len(dirlist) > 0:
    for (dirpath, dirnames, filenames) in os.walk(dirlist.pop()):
        dirlist.extend(dirnames)
        files.extend(map(lambda n: os.path.join(*n),
                         zip([dirpath] * len(filenames), filenames)))

for filename in files:
    # filename = 'src/event/sections/seal.rs'
    with open(filename,'r') as file:
        lines = [line for line in file]
        i = 0
        stack = 0
        for i in range(len(lines)):
            line = lines[i]
            # NOTE: change this regex below to match what you want
            # E.g., enum, fn, etc.
            if line == "\n" or re.match(r"[^\/]*\benum\b.*{",line) is None:
                continue
            print(line,end='')
            stack += 1
            for j in range(i+1, len(lines)):
                line = lines[j]
                if line == "\n" or re.match(r"\s*\/.*",line):
                    continue
                print(line,end='')
                for k in line:
                    if k == '}':
                        stack -= 1
                    if k == '{':
                        stack += 1
                if stack == 0:
                    break