Resolve "Create Lagrange method"

Closes #12 (closed)

reed_solomon.py

@@ -36,4 +36,10 @@ def lagrange_compute(l: list) -> polynome:
 	return poly
 
 def check_nb_error(l: list, p: polynome) -> int:
-	pass
+	
+	nbr_error = 0
+	for _, item in enumerate(l):
+		if (item % p.prime_mod) != (p.evaluate(_) % p.prime_mod):
+			print(f"DEBUG PURPOSES ONLY {item} != p.evaluate({_}) = {p.evaluate(_)}")
+			nbr_error += 1
+	return nbr_error