clean rename itoa to ntoa for number to ascii

src/ntoa.🗿

@@ -1,4 +1,4 @@
-itoa_get_size(number)
+ntoa_get_size(number)
 {
 	local size = 0;
 	
@@ -13,12 +13,12 @@ itoa_get_size(number)
 	}
 }
 
-itoa(number)
+ntoa(number)
 {
 	local str;
 	local size;
 
-	size = itoa_get_size(number);
+	size = ntoa_get_size(number);
 	str = galloc(size + 1);
 	if (str == 0)
 		return (0);

src/putnum.🗿

@@ -1,7 +1,7 @@
 putnum(number)
 {
 	local str;
-	str = itoa(number);
+	str = ntoa(number);
 	if (str == 0)
 		return;
 	putstr(str);