args before: [[]]
[args were not changed]
result: ""

args before: [["aac","adbc","abc"]]
[args were not changed]
result: "c"

args before: [["ab","ab","abc"]]
[args were not changed]
result: ""

args before: [["ab","ab","ab"]]
[args were not changed]
result: "ab"

args before: [["aldjfaldkjaaa","abaaa","abcaaa"]]
[args were not changed]
result: "aaa"

args before: [["adfadsc","abc","abc"]]
[args were not changed]
result: "c"

args before: [["edfadsc","abc","abc"]]
[args were not changed]
result: "c"