Swift - Write program to find out the position of the "q" character in the string

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Requirements

Given the following statement, write the solution to find out the position of the "q" character in the string: 

var str1 = "The quick brown fox jumps over the lazy dog"

Hint

You can use the find() function together with the distance () function to obtain the position of the "q" character:

Demo

var str1 = "The quick brown fox jumps over the lazy dog"
let char:Character = "q"
if let charIndex = find(str1, char) {
   let charPosition = distance (str1.startIndex, charIndex)
   print(charPosition)  //4---
}

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