we can reaad CDROMS

kernel/lib/memory.c

@@ -0,0 +1,24 @@
+#include "memory.h"
+
+void memcpy(const void* src, void* dst, size_t sz) {
+    for (size_t i = 0; i < sz; i++) {
+        ((uint8_t*)dst)[i] = ((uint8_t*)src)[i];
+    }
+}
+
+int strcmp(const char* s1, const char* s2) {
+    while (*s1 && (*s1 == *s2)) {
+        s1++;
+        s2++;
+    }
+    return *(const uint8_t*)s1 - *(const uint8_t*)s2;
+}
+
+int strlen(const char* str) {
+    int len = 0;
+    while(*str != 0) {
+        str++;
+        len++;
+    }
+    return len;
+}