Imparare una competenza

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "user.h"

int main() {
    User u;
    User_init(&u, "", "");
    char line[1024];
    while (fgets(line, sizeof(line), stdin)) {
        line[strcspn(line, "\r\n")] = '\0';
        char* cmd = strtok(line, " \t");
        if (!cmd) continue;
        if (strcmp(cmd, "new") == 0) {
            char* un = strtok(NULL, " \t");
            char* em = strtok(NULL, " \t");
            User_init(&u, un ? un : "", em ? em : "");
        }
        if (strcmp(cmd, "username") == 0) { printf("%s\n", u.username); }
        if (strcmp(cmd, "email") == 0) { printf("%s\n", u.email); }
        if (strcmp(cmd, "setLocation") == 0) { char* v = strtok(NULL, " \t"); if (v) User_setLocation(&u, v); }
        if (strcmp(cmd, "getLocation") == 0) { printf("%s\n", User_getLocation(&u)); }
        if (strcmp(cmd, "info") == 0) { User_info(&u); }
        if (strcmp(cmd, "learn") == 0) { char* v = strtok(NULL, " \t"); if (v) User_learn(&u, v); }
        if (strcmp(cmd, "dumpSkills") == 0) {
            int idx[USER_MAX_SKILLS]; int n = u.skillCount;
            for (int i = 0; i < n; i++) idx[i] = i;
            for (int i = 0; i < n - 1; i++) {
                for (int j = 0; j < n - 1 - i; j++) {
                    if (strcmp(u.skills[idx[j]].name, u.skills[idx[j+1]].name) > 0) {
                        int t = idx[j]; idx[j] = idx[j+1]; idx[j+1] = t;
                    }
                }
            }
            for (int i = 0; i < n; i++) {
                printf("%s: %d\n", u.skills[idx[i]].name, u.skills[idx[i]].level);
            }
        }
    }
    return 0;
}