Write code for a function with the following prototype:
/*
* Do rotating left shift. Assume 0 <= n < w
* Examples when x = 0x12345678 and w = 32:
* n=4-> 0x23456781, n=20 -> 0x67812345
*/
unsigned rotate_left(unsigned x, int n);
Your function should follow the bit-level integer coding rules (page 128). Be careful of the case n = 0.

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