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feat: finish plus one

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alternative/easy
- plus_one.py

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`‎alternative/easy/plus_one.py‎`

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	`1`	`+def plus_one(digits):`
	`2`	`+ i = len(digits) - 1`
	`3`	`+ while i >= 0:`
	`4`	`+ if digits[i] == 9:`
	`5`	`+ digits[i] = 0`
	`6`	`+ if i == 0:`
	`7`	`+ digits.insert(0, 1)`
	`8`	`+ break`
	`9`	`+ i -= 1`
	`10`	`+ else:`
	`11`	`+ digits[i] += 1`
	`12`	`+ break`
	`13`	`+ return digits`
	`14`	`+`
	`15`	`+# Test cases`
	`16`	`+assert plus_one([1, 2, 3]) == [1, 2, 4]`
	`17`	`+assert plus_one([4, 3, 2, 1]) == [4, 3, 2, 2]`
	`18`	`+assert plus_one([0]) == [1]`
	`19`	`+assert plus_one([9]) == [1, 0]`
	`20`	`+assert plus_one([9, 9]) == [1, 0, 0]`
	`21`	`+assert plus_one([9, 9, 9]) == [1, 0, 0, 0]`
	`22`	`+assert plus_one([9, 9, 9, 9]) == [1, 0, 0, 0, 0]`
	`23`	`+assert plus_one([9, 9, 9, 9, 9]) == [1, 0, 0, 0, 0, 0]`

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