Write a function has$\_$unique$\_$characters$($string$)$ that takes a string as input

and returns True if all characters in the string are unique, and False otherwise $(10$ pts$).$

Examples

has$\_$unique$\_$characters$(\text{'}$arm$\text{'})--->$ returns True

has$\_$unique$\_$characters$(\text{'}$common$\text{'})--->$ returns False

Hint: $\text{'}$T$\text{'}$ and $\text{'}$t$\text{'}$ are considered to be the same

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$"""$

# Write your solution for problem $2$ here.