Implemented the <string.h> memset() function.
Implemented the <string.h> memset() function.

ZakharBondia/libc11,dryc/libc11,dryproject/libc11,dryproject/libc11,ZakharBondia/libc11,dryc/libc11,dryproject/libc11,dryc/libc11,ZakharBondia/libc11