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There are a number of things to take into consideration here. Like how many consecutive capital characters do you need to find after a lower case character to know to do the conversion? Do you need to check for capital characters on both sides of a space to make sure you aren't converting an abreviation? Will your input contain an accidental caps sequence in the middle of the sentence or will it always be from the second character on?
Handling the long string is easy, increase the size of your array. You may also want to look at some additional functions available to you in C such as isupper, islower, toupper and tolower. If you may have other characters thrown at you, you may also want to look at isalpha.
Knowing more of your homework assignment details will help us point you in the right direction.
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