我试图为用户名和电话号码做一个简单的记忆，这样用户就可以在代码的最后引用它，但是存储在name1中的字符串在再次打印出来时似乎丢失了：

// Online C compiler to run C program online
#include <stdio.h>
#include <string.h>
//Intialisation 
int main() {
    // Write C code here
char name1[30], name2[30], phonenumber[30], final
    int userdetailchecker = 2;
    int finalconfirmation = 0;
    printf("\n\n******GMI KOPERASI ORDER AND SELF-PICK-UP SERVICE******\n");
    printf("|You have to register your details to access this service|\n");
    while(userdetailchecker != 1){
    printf("Please enter your first name: ");
    scanf("%s", name1);
     printf("Please enter your last Name: ");
     scanf("%s", name2);
    strcat(name1," ");
strcat(name1, name2);
   

    printf("Is your name %s?\n1.Yes\n2.No\n", name1);
    scanf("%d", &userdetailchecker);
    }
    printf("Great! Your orders would be associated with the username %s", name1);
    printf("\nPlease enter your phone number: ");
    scanf("%s", phonenumber);
     while(strlen(phonenumber) < 9 || strlen(phonenumber) > 13){
     printf("Invalid phone number(Must be 9 to 13 digits only)");
     printf("\nPlease enter your phone number: ");
     scanf("%s", phonenumber);
     }
     printf("You have successfully registered your phone number! (%s)", phonenumber);
     printf("\n\nHello user %s!\n", name1);
     printf("Continue to end section? y/n?\n");
     char check[3];
     scanf("%s", check);
     if(strcmp(check, "yes") == 0)
    {
     printf("\nPlease confirm your user details");
    printf("\nUsername = %s", name1);
    printf("\nPhone number = %s", phonenumber);
    printf("\n1.Yes\n2.No\n");
    while(1){
    scanf("%d", &finalconfirmation);
    if(finalconfirmation == 2)
    {
    printf("Please log out of this session.");
    break;
    }
    }
    }
    else{
        return 0;
    }
    return 0;
}

我已经做了一段时间了但毫无结果将感谢帮助和提示