Two strings the have same pointer address

Why is this so? Here's my code:

import (
    "database/sql"
    "fmt"
    "reflect"        

    "github.com/fatih/structs"
)

type UserLogin struct {
    Username string
    Password string
}

func Login() {
    row := sql.QueryRow("SELECT username, password FROM users WHERE username=?", "golang")

    userLoginKeys := structs.Names(UserLogin{})
    keys := make([]interface{}, len(userLoginKeys), len(userLoginKeys))
    for i, val := range userLoginKeys {
	    keys[i] = &val
        fmt.Println(val)
    }

    fmt.Println(keys)

    _ := row.Scan(keys...)
    v1 := reflect.ValueOf(keys[0]).Elem().String()
    v2 := reflect.ValueOf(keys[1]).Elem().String()
    fmt.Println(v1)
    fmt.Println(v2)
}

It prints

Username
Password
[0xc4201ca2c0 0xc4201ca2c0] 
$2a$10$F6hR0scvtbFDx0l1GR.OX.ZweozUzwKVTG3H8GBQxpYCEdFifDrzy
$2a$10$F6hR0scvtbFDx0l1GR.OX.ZweozUzwKVTG3H8GBQxpYCEdFifDrzy

As you can see, keys contains the same address to two different strings. As a result, their values are the same.

My goal is to map username and password to UserLogin struct.

Change keys[i] = &val to keys[i] = &userLoginKeys[i], so you can get different addresses.

for i, val := range userLoginKeys {
    keys[i] = &val
    fmt.Println(val)
}

here, val is an independent variable whose address you are assigning to keys[i]. So both time you are getting same address.

Try this:

for i:=0; i<len(userLoginKeys); i++ {
    keys[i] = &userLoginKeys[i]
    fmt.Println(keys[i])
}

You are assigning keys[i] = &val in your loop, this is assigning the same address to each array element. This also means that you are only getting the last value. What you probably want is keys[i] = val (and set the map to use strings instead of *strings).