restructure fs

example/core/array.nub

@@ -0,0 +1 @@
+extern func arr_size(array: Array<Any>): int64;

example/core/print.nub

@@ -0,0 +1,38 @@
+let SYS_WRITE = 1;
+let STD_OUT = 1;
+let STD_ERR = 2;
+
+func print(msg: String) {
+    syscall(SYS_WRITE, STD_OUT, msg, str_len(msg));
+}
+
+func print(value1: int64) {
+    print(itoa(value1));
+}
+
+func print(value2: bool) {
+    if value2 {
+        print("true");
+    } else {
+        print("false");
+    }
+}
+
+func println() {
+    print("\n");
+}
+
+func println(msg: String) {
+    print(msg);
+    println();
+}
+
+func println(value3: bool) {
+    print(value3);
+    println();
+}
+
+func println(value4: int64) {
+    print(value4);
+    println();
+}

example/core/string.nub

@@ -0,0 +1,2 @@
+extern func str_len(msg: String): int64;
+extern func itoa(value: int64): String;