write simple memcpy function

src/string.c

 #include "string.h"
 #include <stdbool.h>
 
-void *memset(void *s, int c, size_t n){
+void *memset(void *s, int c, size_t n)
+{
     unsigned char* p=s;
     while(n--)
 	*p++=(unsigned char) c;
     return s;
 }
 
+void memcpy(void* dest, void* src, size_t n)
+{
+    size_t i;
+    char* d = (char*) dest;
+    char* s = (char*) src;
+    for (i = 0; i < n; ++i)
+    {
+        d[i] = s[i];
+    }
+}
+
 void reverse ( char s[] )
 {
     int c, i, j;

src/string.h

@@ -2,7 +2,8 @@
 #define _STRING_ING
 #include<stddef.h>
 
-void* memset(void *s, int c, size_t n);
+void* memset(void* s, int c, size_t n);
+void memcpy(void* dest, void* src, size_t n);
 void itoa(int n, char s[]);
 size_t strlen(const char* str);
 int strcmp(const char* s1, const char* s2);