def write_to_file(filename, content):
    with open(filename, 'w') as file:
        file.write(content)
    print(f"Written to {filename}")

def read_from_file(filename):
    try:
        with open(filename, 'r') as file:
            content = file.read()
        return content
    except FileNotFoundError:
        return "File not found"

write_to_file("test_output.txt", "Hello, World!\nThis is a test.\n")
content = read_from_file("test_output.txt")
print(f"File content:\n{content}")

print(read_from_file("nonexistent.txt"))