Given a string s consisting of words and spaces, return the length of the last word in the string.A word is a maximal substring consisting of non$-$space characters only. Example $1$:Input: s $=$ "Hello World"Output: $5$Explanation: The last word is "World" with length $5.$Example $2$:Input: s $="$ fly me to the moon "Output: $4$Explanation: The last word is "moon" with length $4.$Example $3$:Input: s $=$ "luffy is still joyboy"Output: $6$Explanation: The last word is "joyboy" with length $6.$ Constraints:$1<=$ s$.$length $<=104$s consists of only English letters and spaces $\text{'}\text{'}.$There will be at least one word in s$.$