update math with itoa base

module06/ex00/math.c

@@ -30,3 +30,35 @@ void int_to_string(uint64_t value, char *buffer) {
 		size--;
 	}
 }
+
+void itoa_base(uint64_t value, char *buffer, uint8_t base) {	// buffer must have the right size
+    if (base < 2 || base > 36) {
+        buffer[0] = '\0';										// unsupported base
+        return;
+    }
+
+    // handle zero case
+    if (value == 0) {
+        buffer[0] = '0';
+        buffer[1] = '\0';
+		return;
+    }
+
+	uint8_t size = 0;
+	uint64_t copy = value;
+
+	while (copy) {
+		copy /= base;
+		size++;
+	}
+
+    buffer[size] = '\0';										// null-terminate the string
+    size--;														// adjust index for last digit
+
+	while (value) {
+		uint8_t digit = value % base;
+		buffer[size] = digit < 10 ? ('0' + digit) : ('A' + digit - 10);
+		value /= base;
+		size--;
+	}
+}