The function appears to shift each character in an input string by a constant value.

[CODE]:
def approximate_function(input_string):
    output = ""
    for c in input_string:
        new_char = chr(((ord(c) - ord('a') + 7) % 26) + ord('a'))
        output += new_char
    return output

Please provide more input strings to verify and refine the description of the function.

COMMAND: PYTHON(./temp/function.py "shift" "example" "analyze")