Write a C function void title(const char str[]) that takes a zeroterminated string as an input, and prints it such that every word of the string is printed with its first letter capitalized (upper-case). Here, a word is defined as a sequence of non-space character separated by one or more space characters.

Certainly! Here's the implementation of the `title` function in C:

#include <stdio.h>
#include <ctype.h>

void title(const char str[]) {
    int i = 0;
    int capitalize = 1;
    
    while (str[i] != '\0') {
        // Skip leading spaces
        while (str[i] == ' ') {
            i++;
        }
        
        // Capitalize the first letter of the word
        if (capitalize) {
            printf("%c", toupper(str[i]));
            capitalize = 0;
        } else {
            printf("%c", str[i]);
        }
        
        // Move to the next character
        i++;
        
        // Check if the current word has ended
        if (str[i] == ' ' || str[i] == '\0') {
            // Move to the next line
            printf("\n");
            capitalize = 1;
        }
    }
}

You can use this function to print a string such that every word is printed with its first letter capitalized. For example:

int main() {
    const char str[] = "hello  world!  this is  a test.";
    title(str);
    return 0;
}

Output:

Hello
World!
This
Is
A
Test.

Please note that consecutive spaces are treated as a single separator between words.