Implement a Simple Shell Command Parser

Code

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

void parse_shell_input(char *line) {
    int i;
    int k;
    char *str = (char *)malloc(20);

    i = 0;
    k = 0;
    while(line[i])
    {
        if(line[i] == ' ')
        {
            while(line[++i] == ' ')
                ;
            str[k] = '\0';
            printf("%s\n", str);
            k = 0;
            continue;
        }

        str[k++] = line[i++];
    }
    str[k] = '\0';
    printf("%s\n", str);
}

int main() {
    char line[101];
    fgets(line, sizeof(line), stdin);

    parse_shell_input(line);
    return 0;
}

Solving Approach