Test if a given string starts with 'ab'

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func first_to_last(_ str1: String) -> String {
    var chars = str1.characters
    let first_char = chars.removeFirst()
    let second_char = chars.removeFirst()
    chars.append(first_char)
    chars.append(second_char)
    
    return String(chars)
}
print(first_to_last("Swift"))
print(first_to_last("Python"))

 


Output:

iftSw
thonPy

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Create a new string made of 2 copies of the first 2 characters of a given string
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import Foundation
func two_copies(_ str1: String) -> String {
...

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