Remove Leading Zeros

1#include <stdio.h>
2#include <string.h>
3
4void removeLeadingZeros(char str[]) {
5    int i = 0;
6    
7    // Skip leading zeros
8    while (str[i] == '0') {
9        i++;
10    }
11    
12    // If all zeros, keep one
13    if (str[i] == '\0') {
14        str[0] = '0';
15        str[1] = '\0';
16        return;
17    }
18    
19    // Shift remaining characters
20    int j = 0;
21    while (str[i]) {
22        str[j++] = str[i++];
23    }
24    str[j] = '\0';
25}
26
27int main() {
28    char str1[] = "00012345";
29    char str2[] = "0000";
30    char str3[] = "01020304";
31    
32    printf("Original: %s  -> ", str1);
33    removeLeadingZeros(str1);
34    printf("Result: %s\n", str1);
35    
36    printf("Original: %s      -> ", str2);
37    removeLeadingZeros(str2);
38    printf("Result: %s\n", str2);
39    
40    printf("Original: %s -> ", str3);
41    removeLeadingZeros(str3);
42    printf("Result: %s\n", str3);
43    
44    return 0;
45}