Editing base64, Adding average file, Editing find_lcm (#673)

* avrage.py

calculate and print the avrage of number list.

* Update base64_cipher.py

encoding and decoding base64 without any module.

* Update and rename avrage.py to average.py

* update find_lcm algorithm

I made find_lcm more efficient form O(num1*num2) to O(min{num1,num2}).

Maths/average.py

@@ -0,0 +1,14 @@
+def average(nums):
+    sum = 0
+    n = 0
+    for x in nums:
+      sum += x
+      n += 1
+    avg = sum / n
+    print(avg)
+
+def main():
+  average([2, 4, 6, 8, 20, 50, 70])
+
+if __name__ == '__main__':
+  main()

Maths/find_lcm.py

@@ -1,10 +1,11 @@
 def find_lcm(num_1, num_2):
     max = num_1 if num_1 > num_2 else num_2
+    lcm = max
     while (True):
-        if ((max % num_1 == 0) and (max % num_2 == 0)):
+        if ((lcm % num_1 == 0) and (lcm % num_2 == 0)):
             break
-        max += 1
-    return max
+        lcm += max
+    return lcm
 
 
 def main():