Fix clean build and remove object

src/lib.rs

@@ -1,5 +1,6 @@
 #![no_std]
 
+mod nanolibc;
 mod sys;
 
 pub use sys::*;

src/nanolibc.rs

@@ -0,0 +1,33 @@
+#[no_mangle]
+pub unsafe extern "C" fn memcpy(dest: *mut u8, src: *const u8, n: usize) -> *mut u8 {
+    for i in 0..n {
+        *dest.add(i) = *src.add(i);
+    }
+
+    dest
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn memset(s: *mut u8, x: i32, n: usize) -> *mut u8 {
+    for i in 0..n {
+        *s.add(i) = x as u8;
+    }
+
+    s
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn memcmp(s1: *mut u8, s2: *const u8, n: usize) -> i32 {
+    for i in 0..n {
+        let x = *s1.add(i);
+        let y = *s2.add(i);
+        if x == y {
+            continue;
+        }
+
+        let (x, y) = (i32::from(x), i32::from(y));
+        return x - y;
+    }
+
+    0
+}