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Insert into the string.
constexpr iterator insert( const_iterator pos, value_type ch);
            Inserts the character ch
            before the character pointed by pos.
          
            posshall be vaild within
            {data(), data() + size()}
          
Strong guarantee.
All references, pointers, or iterators referring to contained elements are invalidated. Any past-the-end iterators are also invalidated.
            An iterator which refers to the first inserted character or pos if no characters were inserted
          
| Name | Description | 
|---|---|
| 
                       | The index to insert at. | 
| 
                       | The character to insert. | 
| Type | Thrown On | 
|---|---|
| 
                       | 
                       |