go是如何分配記憶體的？

func main() {
    a := 1
    b := 2
    c := "hello world"
    d := 1
    fmt.Printf("var a address is %p\n", &a)//var a address is 0xc0420361d0
    fmt.Printf("var b address is %p\n", &b)//var b address is 0xc0420361d8
    fmt.Printf("var c address is %p\n", &c)//var c address is 0xc0420361e0
    fmt.Printf("var d address is %p\n", &d)//var d address is 0xc0420361f0

}

變數 c 的大小明顯超過了 2B，為什麼還是隻佔了 2B 的長度？golang 的變數記憶體是如何分配的？