First Unique Character in a String

Try to solve the First Unique Character in a String problem.

We'll cover the following

Statement

For a given string of characters, s, your task is to find the first non-repeating character and return its index. Return −1-1 if there’s no unique character in the given string.

Constraints:

  • Only lowercase english letters are accepted.
  • There are no spaces in the string.

Examples

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