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    I'm not really sure this is on-topic here. But regarding your first approach - if you don't like concatenating so much, why are you bothering with remembering the current longest word, rather than its start and end position? Commented Mar 11, 2019 at 11:47
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    Note that your examples should reset currentWord when the find a space, rather than when they mark something as longer Commented Mar 11, 2019 at 12:02
  • Is this homework? Commented Mar 11, 2019 at 13:20
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    You're essentially just reimplementing string.split. How is that really accomplishing anything with the artificial requirement not to use it? Commented Mar 11, 2019 at 15:21
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    Let me give you some doesn't-answer-the-question advice: Just about every language's standard library has functions for doing these things. They're well-solved problems and often available in source form. If you want to know how they've been implemented by the more-experinced, study them. Commented Mar 11, 2019 at 15:22