Question: 
Write a python function to find the first repeated character in a given string.


Model's Code:
def first_repeated_char(s):
    seen = set()
    for char in s:
        if char in seen:
            return char
        seen.add(char)
    return "None"



Sample Correct Code:
def first_repeated_char(str1):
  for index,c in enumerate(str1):
    if str1[:index+1].count(c) > 1:
      return c 
  return "None"


Asserts:
assert first_repeated_char("abcabc") == "a"
assert first_repeated_char("abc") == "None"
assert first_repeated_char("123123") == "1"


Tests:
Test 1 of 3: PASS
Test 2 of 3: PASS
Test 3 of 3: PASS

Test 602 of 974: 448/602 (74.4186046511628%): success