You are given a string s consisting of printable characters.
Your task is to return the string with its characters in reverse order.
You may assume that:
"hello"
"olleh"
The characters of "hello" reversed are "olleh".
"abcd"
"dcba"
The characters of "abcd" reversed are "dcba".
""
""
An empty string reversed is still an empty string.
"hello"
"olleh"