Find First Repeated Character In a String | Amazon Interview Question 2020 [LeetCode]

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Coding Interviews First Duplicate Character in a String/First Repeating Character in a String (LeetCode) question and explanation.
This interview question is commonly asked by the following companies: Amazon, Facebook, Google, Bloomberg Microsoft, Goldman Sachs, Apple, Yahoo.

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if the string were 'titorial', the function would have returned 'i' but the actual output should be 't', how can be handle that?

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