Question: 
Write a python function to convert the given string to lower case.


Model's Code:
def is_lower(s):
    return s.lower()



Sample Correct Code:
def is_lower(string):
  return (string.lower())


Asserts:
assert is_lower("InValid") == "invalid"
assert is_lower("TruE") == "true"
assert is_lower("SenTenCE") == "sentence"


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

Test 477 of 974: 351/477 (73.58490566037736%): success