Considering we have few strings:

```
s1 = "dasbdk        "
s2 = "asdnkal asn knkl nkn dvklsn     "
s3 = "    jbjkbasd nklnkln     "

```

**Q1:**

How can the blank-spaces **in the end only** be trimmed out to have the following result:

```
s1 = "dasbdk"
s2 = "asdnkal asn knkl nkn dvklsn"
s3 = "    jbjkbasd nklnkln"

```

**Q2**

How can any 2-or-more sequence of blank-spaces be trimmed out to have the following result:

```
s1 = "dasbdk"
s2 = "asdnkal asn knkl nkn dvklsn"
s3 = "jbjkbasd nklnkln"

```

Thanks!