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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def copy_tree(src, dst):
 """Copy directory tree"""

    for root, subdirs, files in os.walk(src):
        current_dest = root.replace(src, dst)
        if not os.path.exists(current_dest):
            os.makedirs(current_dest)
        for f in files:
            shutil.copy(os.path.join(root, f), os.path.join(current_dest, f))