The function swaps every other character in the input string.
[CODE]: 
```python
def approximate_function(s):
    new_s = list(s)
    for i in range(0, len(s) - 1, 2):
        new_s[i], new_s[i + 1] = new_s[i + 1], new_s[i]
    return ''.join(new_s)
```