Either way, the short answer is you can't. You have to make a new array, and copy into it everything except the bit you don't want, OR you can copy everything to the right of the part you don't want over the top of the part you don't want, and write a zero at the new ending of it's an array of char
DON'T. This is C++. Use a vector instead of an array, and use the provided functions to remove elements from the vector.