modified gcd.md to fewer lines of code

modify gcd.md to fewer lines of code

modified README

snippets/gcd.md

@@ -1,38 +1,17 @@
 ### gcd
 
-:information_source: `math.gcd` works with only two numbers
+Calculates the greatest common divisor of a list of numbers.
 
-Calculates the greatest common divisor between two or more numbers/lists.
-
-The `helperGcdfunction` uses recursion. Base case is when `y` equals `0`. In this case, return `x`. Otherwise, return the GCD of `y` and the remainder of the division `x/y`.
-
-Uses the reduce function from the inbuilt module `functools`. Also defines a method `spread` for javascript like spreading of lists.
+Uses the reduce function from the inbuilt module `functools`. Also uses the `math.gcd` function over a list.
 
 ```python
 from functools import reduce
+import math
 
-
-def spread(arg):
-    ret = []
-    for i in arg:
-        if isinstance(i, list):
-            ret.extend(i)
-        else:
-            ret.append(i)
-    return ret
-
-
-def gcd(*args):
-    numbers = []
-    numbers.extend(spread(list(args)))
-
-    def _gcd(x, y):
-        return x if not y else gcd(y, x % y)
-
-    return reduce((lambda x, y: _gcd(x, y)), numbers)
+def gcd(numbers):
+    return reduce(math.gcd, numbers)
 ```
 
-
 ``` python
-gcd(8,36) # 4
+gcd([8,36,28]) # 4
 ```