fix: wrong answer of find_common_string
#1811
| Job | Run time |
|---|---|
| 52s | |
| 39s | |
| 35s | |
| 1m 0s | |
| 30s | |
| 3m 36s |
find_common_string
#1811
| Job | Run time |
|---|---|
| 52s | |
| 39s | |
| 35s | |
| 1m 0s | |
| 30s | |
| 3m 36s |