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Copying a part of a string (substring) in C

I have a string:

char * someString;

If I want the first five letters of this string and want to set it to otherString, how would I do it?

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#include <string.h>
...
char otherString[6]; // note 6, not 5, there's one there for the null terminator
...
strncpy(otherString, someString, 5);
otherString[5] = ''; // place the null terminator

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