0101~0110

0111~0120

0121~0130

0131~0140

0141~0150

/**
 * @param character: a character
 * @return: a character
 */
func LowercaseToUppercase(character byte) byte {
    // write your code here
    character -= 32
    return character
}

/**
 * @param letters: A string
 * @return: A string
 */
import "strings"
func LowercaseToUppercase2(letters string) string {
    // write your code here
    return strings.ToUpper(letters)
}

/**
 * @param letters: A string
 * @return: A string
 */
func LowercaseToUppercase2(letters string) string {
    // 65 - 90 A-Z
    // 97 - 122 a-z
    sp := []byte(letters)
    for i, v := range sp {
        if v >= 97 && v <= 122 {
            sp[i] = byte(v - 32)
        }
    }
    return string(sp)
}