Write the standard ml code using pattern matching and recursion for the function “repeatStr”, which takes an input (a string and integer) and returns repeat of the string in the given number of times delimited by single white space. For example,
repeatStr (“abc”, 3) will return “abc abc abc ”. The base case returns a number of white spaces as an output. For example, repeatStr (“”, 3) will return “ ”.
Once you create your function repeatStr,

and explain how you get the expected output (result) with your pen and paper. Do
not use a computer! Briefly explain your code to get credit. (15 points)
test your function by feeding sample input