2^15 = 32768 and the sum of its digits is 3 + 2 + 7 + 6 + 8 = 26.
What is the sum of the digits of the number 2^N?
Thanks to Project Euler Problem 16.
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added a test case to make it a wee bit harder
ta cần nhân 2 cho đến khi đủ mũ n và hãy lưu ý rằng nên để kết quả dưới dạng char để tránh bị tràn số vì input là mũ rất lớn