def solution(str1, str2):
answer = ''
for i in range(len(str1)):
answer = answer + str1[i] + str2[i]
return answer
곧 훌륭해질 거에요!
def solution(str1, str2):
answer = ''
for i in range(len(str1)):
answer = answer + str1[i] + str2[i]
return answer