diff --git a/lib/conv.c b/lib/conv.c
index 8c9284c..731ea6a 100644
--- a/lib/conv.c
+++ b/lib/conv.c
@@ -1,12 +1,13 @@
 #include "conv.h"
 
 void int_to_str(int i, char* buf) {
-	bool use_sign = false;
+	uint num = (uint)i; // convert to uint
+	uint len = ulong_len(num); // number of digits
 
-	if( i < 0 ) {
-		i = (ulong)(i * (-1))
-		use_sign = true;
-	}
+	&buf[len] = '\0'; // add a "end-of-string" at the end
+
+	int j;
+	for(j = 0; j < len; j++) // iterate over each digit and assign it to the buffer
+		&buf[j] = (char)(ndigit(num, len-1-j) + ASCII_OFFSET); // apply the ascii offset so that i becomes a char
 
-	uint len = ulong_len(i); 
 }
diff --git a/lib/conv.h b/lib/conv.h
index 3e4e383..776644b 100644
--- a/lib/conv.h
+++ b/lib/conv.h
@@ -1,3 +1,5 @@
 #include "types.h"
 
+#define ASCII_OFFSET 0x30
+
 void int_to_str(int i, char* buf);
diff --git a/lib/util.c b/lib/util.c
index f534869..4690128 100644
--- a/lib/util.c
+++ b/lib/util.c
@@ -1,10 +1,14 @@
 #include "util.h"
 
-uint ulong_len(ulong i) {
+uint ulong_len(ulong n) { // get the digit length of a number
     int len = 0;
-    while (i != 0) {
-        i = i / 10;
+    while (n != 0) {
+        n = n / 10;
         ++len;
     }
     return len;
 }
+
+uint ndigit(ulong n, uint i) { // OBS: index order is reversed
+	return (n/(10**i)) % 10
+}
diff --git a/lib/util.h b/lib/util.h
index 6c4e531..2cebf96 100644
--- a/lib/util.h
+++ b/lib/util.h
@@ -1,3 +1,4 @@
 #include "types.h"
 
 uint ulong_len(ulong n);
+uint ndigit(ulong n, uint i);