update ft_sqrt with precision

srcs/ft_sqrt.c

@@ -4,17 +4,13 @@
  * return the square root of nb
  * Newton–Raphson method : https://en.wikipedia.org/wiki/Newton%27s_method#Use_of_Newton's_method_to_compute_square_roots
  */
-double ft_sqrt(double x)
+double ft_sqrt(double x, double precision)
 {
-	double precision;
-
 	if (x < 0)
 		return -1; // handle negative numbers
 	if (x == 0)
 		return 0;
 
-	precision = 0.00001;
-
 	// Newton-Raphson
 	double guess = x;
 	double prev_guess;