I have the following string:

```py
'___5weeks_rollingAverage_8hours'
'___5weeks__rolling=*%Average_8hours'
'___5weeks_rollingAverage_8hours__'
'___5weeks_rollingAverage_8hours'

```

I wish to remove `_` if it appears more than once anywhere in the string. So the above should translate to:

```py
5weeks_rollingAverage_8hours

```

tvm