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insert 

        # String.insert

(from ruby core)
---
    insert(index, other_string) -> self

---

Inserts the given `other_string` into `self`; returns `self`.

If the Integer `index` is positive, inserts `other_string` at offset
`index`:

    'foo'.insert(1, 'bar') # => "fbaroo"

If the Integer `index` is negative, counts backward from the end of
`self` and inserts `other_string` at offset `index+1` (that is, *after*
`self[index]`):

    'foo'.insert(-2, 'bar') # => "fobaro"

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