Fix issue when input ('a','b') to isSubsequence #1
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If user input ('a','b') to isSubsequence iterative, it would be return unexpected result. Since `i = 0` now is equal to `str1.length - 1`
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If user input ('a','b') to isSubsequence iterative, it would be return unexpected result. Since
i = 0now is equal tostr1.length - 1