A string is an array of chars or bytes. The last byte is NULL. Now we need to iterate till last NULL to get the length of the string.
Index of the array starts with 0. If a length of a string in len then total len+1 elements are there. Now we need to swap the char at index 0 with index len - 1. These are mirror opposite positions. Same way we need to iterate i=1,2,... till the mid of the string which is (len/2).
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