如何在 c 编程中处理一维数组的索引？

Question

input
1 2
2 3
1 5
5 2
5 6
4 7

If i receive 6 strings including blank, I want to change them to integers such as

output
12
23
15
52
56
47

how can i make this program in c??

int input_strings(int arraySize){
scanf("%d",&arraySize); 
char * names[arraySize];
char buffer[30]; 
int n = 0;
int l = 0;

while ( n < arraySize ) {
    scanf("%s", buffer);
   
    
    l = strlen(buffer);
    if (l > 0){
        char* newstrptr = (char*)malloc(sizeof(char) * (l + 1));
        strcpy(newstrptr, buffer);
        names[n] =  newstrptr;
        n++;
    } else {
        break;
    }
}



for(n=0;n<arraySize;n++){
    printf("%02d: %s\n", n, names[n]);
    free(names[n]);
}
return 0;
}

after this code, there will be names[0] ~ names[5]
First question, I want to delete blank that is 2nd index of names[0]. For example, names[0] = "1 2", and I want to delete and make "12".

Second, How can i approach 2nd index of array? If new_names[0] = "12", then How can I approach 2nd index of new_names[0]? should I use two dimensional array?

Answer 1

Does it answer your question? (I assume that your individual numbers cannot have more than 1 digit)

Question 1

#include <stdio.h>
int main() {
    char * str = malloc(4);
    strcpy(str, "1 2");
    str[1] = str[2];
    str[2] = 0;
    printf("%s\n", str); //==> "12"
    free(str);
    return 0;
}

Question 2

#include <stdio.h>
int main() {
    char * str = "12";
    int n = str[1] - '0';
    printf("%d\n", n); //==> 2
    return 0;
}