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Given a String and a target letter, use the linear search algorithm to return the index of the first time that letter appears in the String. Return -1 if the letter does not exist.


linearSearch_string("Hello", "H") → 0
linearSearch_string("Hello", "e") → 1
linearSearch_string("Hello", "l") → 2

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public int linearSearch_string(String str, String letter) { }

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