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Copy bytes to buffer from buffer how to use memcpy

#include <stdio.h> #include <string.h> int main () { char str1[]="I am Superman."; char str2[40]; char str3[40]; memcpy (str2, str1, strlen(str1) + 1); memcpy (str3, "copy successful", 16); printf ("str1= %s\n str2= %s\n str3= %s\n", str1, str2, str3); return 0; }