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Sometimes you need to remove repeats while keeping the original order of the data. The function delete_reoccurring_characters receives a string s. Walk through it from left to right and keep only the first appearance of each character. Skip every later occurrence of a character you have already seen.
["aaabcccc"]"abc"["abcabc"]"abc"["hello"]"helo"def delete_reoccurring_characters(s: str) -> str:
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